Rating: 
Summary: I love it!
Review: Media player - The sound quality is acceptable. It is much better with a headphone or an external speaker.WIFI - excellent reception and not difficult at all to set up. I was in a Chicago and I could even get signals from the building across the river. (For those war-chalking warriors this is it!) ActiveSync - The ActiveSync is easy to use and integrates extremely well with Outlook. The optional Avantgo is very useful too. You can download maps and directions from Mapquest before you go on a road trip. You can even sync bookmarks between your desktop's IE and Pocket IE. For those Chinese-speaking folks, there are tons of software packages out there that allow you to input and read Chinese characters. The one that I am using is called CE Star and it costs 29.99. I must say it's well worth the money. It recognizes my handwriting and it does Simplified and Traditional Chinese translations as well. It even recognizes Japanese characeters! The location of the stylus is on the back of the ipaq which proves to be an inconvenient location if you have your ipaq in a protective case. The form factor of the 4155 is very small. It fits well in the pocket so you can carry it around to impress your friends by, for example, firing up Pocket Excel at the end of the dinner to split up the bill. :P It is definitely one of the most stylish PDAs I've ever seen. PocketPC has long been known as bulky but this 4155 totally changes the game! It's even slimmer and sleeker than a Palm Tungsten. As mentioned by other reviewers, the screen does turn yellow when viewed it from an angle. But c'mon...who looks at his PDA at 170 degrees? The screen is perfectly fine when viewed at normal angles (90 +/- 30). At extreme angles (160+), nothing is readable anyways so why bother?
Rating: 
Summary: Petite power, but for a price
Review: This sleek little baby was a Christmas present to myself after losing my aged Palm V in a cab. I'm very glad I did. Since my Palm had basically become a glorified address book, I was torn between a stripped-down device and a powerful machine that could go well beyond storing names and numbers. Although the iPaq cost the same as my old Palm did three years ago, I still balked a bit at the hefty price tag. But I finally bit after reading many glowing reviews. I also sprang for a 256 megabyte card and a foldable keyboard, both of which have turned out to be great accessories. I'll get my main complaint out of the way first. It takes quite a bit of poking around to figure out how to use this thing, as in being able to find out where files and programs are stored. There are many different folders, some of which have arcane names like "ConnMgr", which I assume is "connection manager" or somesuch, but which contains no readable files. So why even make it visible? Also, as a Palm user for five years, I was used to the simple interface and unified desktop application. A Pocket PC is basically like another drive for your main computer. ActiveSync is pretty seamless when dealing with Outlook (I have the lastest 2003 version, and it even transfers over Notes and recorded sound files that you can then access from your desktop) but doesn't hold your hand as far as transfering files and programs on to the device. This is not to necessarily denigrate HP or Microsoft. This iPaq targets power users who should know their way around a file management system. Once you get oriented with the software, it actually opens up a lot of choices my Palm never gave me. Now a run-down of the good stuff:
-- DESIGN: The size and heft are perfect. Big enough to feel comfortable and sturdy yet small enough to slip in a shirt pocket.
-- SCREEN: Bright and crisp. There is that yellowing when viewed at an angle, but since I always look at the thing straight on I'm not bothered by that.
-- MEDIA: I get much use out of the Media Player as I listen to music during commutes. It is also great to dazzle people with the latest video clip of my young son. Video playback is smooth overall, though there seems to be some dropping of frames. The image viewer is also great for flipping through more photos than my wallet could ever carry.
-- WORK: More than just an ambitious MP3 player, the iPaq has Word and Excel. I've used Word to compose letters and Excel to enter workout data. Both transfer seamlessly over to the desktop. Word is orders of magnitude more powerful than the memo composer on the Palm, and is one of the main reasons why I went for a Pocket PC. I write a lot on a daily basis and wanted something that I could use at meetings or conferences.
-- WIRELESS: I have only used the Wi-Fi and so far only with Starbucks' T-Mobile network. So far it has been easy to use, though that particular service is expensive, and I look forward to the day when wi-fi is ubiquitous and free. I tinkered briefly with Bluetooth, getting the iPaq to recognize my friend's mobile phone, but we didn't have time to actually try to exchange data. Nonetheless, I am pretty sold on the idea of wireless and the iPaq will likely lead to me setting up a home wireless LAN and shopping for Bluetooth gear in the future.
-- OTHER: The note-taking application has proven very useful, and after the media player may be my most-used program. You can type, scrawl, or dictate entries. The voice recorder is of good quality. Overall this device has proven to be all I had hoped. It has taken my mobile computing to a new level and it was definitely worth the extra bucks to get there.
Rating:
Summary: Light, fast ...nearly perfect
Review: My old IPAQ 3835 works great, but its large and clunky, so I decided to retain it as a mostly dedicated GPS for my car, and buy this sweet little Wi-Fi enabled IPAQ 4155. Why this model? There basically are two other Wi-Fi IPAQs but they both have gadgets attached which make them larger, heavier, and thus not as useful. One model has fingerprint recognition (the IPAQ 5555) which is a pretty unnecessary property unless you are a CIA agent. The other has a little keyboard (the IPAQ 4355) and is for people with good eyesight and tiny fingers. This describes most 2 year olds who unfortunately do not type very well despite those little digits. Wi-Fi is the key here. It connects easily to any available wireless network. It is also Bluetooth enabled, a feature for which I have no present need, but you may. So this is the cheapest Wi-Fi IPAQ and the most useful. As to its other Pocket PC features, its display is awesome, bright and clear. Get a 128MB SD card to vastly increase your storage at a reasonable price.
Rating: 
Summary: Never worked--terrible customer service
Review: I ordered an HP iPAQ 4155 online on Nov 27 and received it on Dec 4 just in time to take it with me on a business trip overseas from which I returned just before Christmas. The 4155 never worked--the only screen that ever appeared was the alignment screen. Due to the holidays, I didn't get around to calling HP Technical Service until Jan 8. HP confirmed that the 4155 didn't work and told me that it could be repaired but not replaced because it was more than 30 days since the purchase date(35 days after receipt).HP TA said that the case had to go to Customer Relations to appeal for a new one.Hearing nothing by Jan 21, I called and HP said no customer relat no. was available & to wait one more week to hear from them. I am very unhappy with HP service to date.
Rating:
Summary: Great Product
Review: I have had my 4155 for two months now and I have had none of the problems mentioned in some of the other reviews. I, in fact, dropped my unprotected pda from pocket height onto a marble floor and, while I picked it up with my chest pounding, discovered it suffered not even a scratch. In addition, mine has yet to crash. Blue-Tooth and Wi-Fi work great, plenty of memory for my needs, and the speed is plenty. A little pricey but for the size and functionality I found it worth it.
Rating:
Summary: Smallest full featured iPAQ yet!
Review: If you've been looking for a thin and compact iPAQ with all the essentials including wi-fi and bluetooth, and you don't need a compactflash slot, then this is it. I was online thru my wifi network at home within seconds, almost configures itself. I have a Netgear 802.11g/b system and have easily gone anywhere inside my home as well as outside, approx 50' with no problem at all. I thought this model was the "ultimate" iPAQ until I tried my son's 4355, exactly the same plus integrated "thumb keyboard", and I was surprised by this because I have large fingers. The 4355 is slightly thicker, .1", and less than 1" longer with the keyboard and it's a better design than a Sony Clie because the keys are both larger and better spaced. However if your bottom line is smaller is better then you can't go wrong with the 4155. The only reason it doesn't rate 5 stars is battery life, if hp had used the same battery as used in the 4355 I would have given it 5! Buy an in car charger, problem solved.
Rating:
Summary: buyer beware
Review: do your homework before you buy this device!! it is primarily / solely for folks who work in a wi-fi shop....or spend their life in starbucks. getting it enabled to go on a wireless network is a nightmare...and do not count on the new compaq tech team to be helpful...i spoke to them 3 times, rec'd 3 different ideas on how to proceed. i finally just returned the pretty device. i likened it to a date who looked great but was dysfunctional....
Rating:
Summary: My Fifth Generation PDA
Review: This is my fifth generation PDA--two levels of Sharp organizers followed by two levels of Handspring Visors--and certainly this one wins on display, size, weight, and capability. The wireless capability is great and works well for me both at home and at work. There are three things that keep me from giving it a 5 star rating: 1)the documentation (what little there is) is pitiful--Handspring provided an excellent PDF-based manual; 2)you can't buy the accessories most places--Best Buy, Circuit City, Office Depot, etc. I guess that's what Early Adopters face!; and 3)you have to be very careful to seat the unit properly in the cradle on the first try. If you don't, you'll have to reboot and try again.
Rating:
Summary: Everything I Expected
Review: I purchased the h4155 to upgrade my h3835 that had given me a couple good years of service. The 2 reasons that I made the switch was: 1) the size of the device, 2) Wi-Fi built in without an antenna. After a month of usage, I am very pleased with my choice. The speed is noticeably faster and the new OS is a pleasant change as well. I've used bluetooth a couple of times to transfer files and it has worked well. WiFi works great as well. I can now actually use WiFi instead of fiddling with the settings trying to get IE to work. I'm an avid user and this device has been a real joy. The quality seems good to me (I carry the device in the hp belt case all the time with no problems).
Rating:
Summary: Two words.......... Cracked Screen
Review: I agree with an earlier review, that this product has some reliabliity issues. The screen seems to crack on it's own. I was bending over and the pda slipped about 12inches out of my pocket and cracked the screen (in the protective case). If you are going to spend this much money on something, it seems rediculous to not come with some kind of way to protect the screen. I used to have a Sony TG50 and I dropped it all the time. It took a licking and kept on ticking. It makes me miss my Sony TG50 that came with a protective covering. Warning don't buy without extended warranty that covers cracked screens and a extra durable case that will protect the screen.
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