Rating: 
Summary: Poor quality and a lot of trouble
Review: I am on my third one, the first two having been replaced under warranty. The first one would not play the selections that were stored on external memory. The second one had a very annoying background hum and the third one has that same hum but it isn't as noticeable. If you but one I would recommend that you first listen to it with a good pair of headphones with the volume set to minimum or you also purchase a really cheap pair of ear buds so that you get plenty of outside noise.
Rating: 
Summary: It is very good for the price
Review: ...I didn't get this thing new. I'm borrowing it from a friend, and sure it looks worn down, and the buttons are worn, but it's so sweet. He has a 64 mb chip too and I have 29 songs on it.(some are short, some are long.) Loading it is a breeze if you know at least a little about this type of music stuff. It does take some time understanding the program, but hey... every MP3 player I've read about there has been a complaint about the loading program. If you don't know what you're doing, then don't whine.
Rating: 
Summary: Very Cheap Quality, Sounds Decent
Review: If you're looking for a cheap MP3 player, this might fit the bill, but it has some serious cons. The pros are that it's cheap, USB, lightweight, expandable, and it sounds decent. On the other hand, it feels very cheap and mine has some problems. The plastic feels brittle and I feel that it's going to shatter the first time I drop it (knock on wood). The headphone jack also feels cheap and loose, and I'm afraid it's going to break as well. My unit has a serious problem - when I turn it off, I can't turn it back on without removing the battery and putting it back in. It seems that for some reason it won't turn back on unless the contact is completely severed first. Very strange, and very irritating. It also sucks down batteries very quickly. I wouldn't buy this unless you get a great deal on it.
Rating:
Summary: DON'T BUY IT!!!
Review: Words cannot describe the frustration I have right now after trying for six hours to get this thing hooked up to my computer. I was on the phone with one of their tech reps for over an hour as well, and he finally gave up. It's a problem with the drivers... I cannot believe that any company in America could put out such a shoddy product with such weak documentation... (The rep, though he couldn't help me, did try, so they'll get a small point for that. But don't waste your time, buy something good...
Rating:
Summary: It isn't wery cheap but a low level device.
Review: I was first happy with the player, but soon my happines turned into anger, when the recorded music had distortions, mostly in high frequency range, like a short squeal. My annoyance only increased, when the battery compartment lid under the pressure of the spring (below the battery) broke the small hooks holding the lid. Such as a costumer service or technical support doesn't exist, it is inpossible to contact via e-mail or phone.
The only good things are the push-buttons, they have a good design, the body is light, but the display is primitive. Today we can find on the market for the same price much better and more sophisticated units. I don't recommed the Rio One for buy.
Rating:
Summary: Don't Even THINK About It
Review: I got the flashing USB message after using the machine for approximately three hours. Customer support doesn't exist. Seven emails have netted me three form letters (which apply to Rio-Volt, but not Rio One) and nothing else. I have been unable to find updated firmware on the Rio website (apparently my firmware is up-to-date). Please don't even consider this product, even if you can afford no other MP3 player on the market. Save your money until you can. Hands down, this is the single WORST piece of electronic equipment I have ever purchased. Ever.
Rating:
Summary: DO NOT BUY THIS ITEM!
Review: From day one, the unit had a buzz. The most irritating bug was the unit would randomly shut off and power on while forwarding/ backing up on tracks using the controls or playing tracks in the random setting. The earphone and USB jacks appear to be crimped with pliers. In addition, the battery door closes poorly. RMA'd to Sonic Blue in December, just got the unit on January 18th. A defininate thumbs down! Customer service is absolutely horrific and unknowlegeable. I can't stress enough how much I hate this product and this company. I wish Amazon had a "0" star rating!!!
Rating: 
Summary: Great little mp3!
Review: I got this MP3 player when I bought windows XP.... and I love it.... my favorite part is that it takes smart media cards.... since I already have a bunch of these for my camera I was really happy, plus these are inexpensive to acquire.... whereas most of the other mp3s make you buy their backs or mmc/sd cards.... its easy to use... has great sound and lets me play my music randomly or in order... I can mix a variety of smart media cards if I am going on a trip to match my mood and with a 128mb card it plays more then 5 hours of tunes and the battery (yes thats 1 AA) last more then 10 hours.... this is my very first MP3 player and I am very happy with it.... also has fast download times and easy usb compatibility.... thus far in the past 3 months since I have owned it I have only found one negatives the manual it came with.... not very helpful... but only took me about 10 minutes of playing with it to figure it out.... not bad for a first time mp3 player user....I would definately reccommend this to my friends or buy this item again.
Rating:
Summary: Incessant hum and downloading problems
Review: I bought a Rio One back in September 2001 and, at the time, felt like it was a good deal. However, since then, I have experienced two problems that lead me to strongly advise against getting this player. 99% of my use is in the car with the player hooked up to a cassette adapter, so I didn't realize how bad the sound was until I decided to use it around the house one day. The high quality ear buds that come with the Rio One were its downfall because they accurately reproduced an annoying low-frequency hum that didn't exist when playing the same MP3 files on my computer through the very same ear buds. E-mail with SONICblue tech support resulted in an RMA for a replacement unit. When I received the new one, it also exhibited the hum, so I have come to the conclusion that it's a design flaw, and an unacceptable one at that. The second problem I've had is downloading songs to it from a Mac running MacOS X 10.1. Several times my Mac has gone unresponsive after dismounting the Rio One's media, forcing me to reboot. Also, several times the songs were not cleanly downloaded, leaving portions of the previous download's songs toward the end of the newly downloaded tracks. I have given up and replaced it with a Nomad IIc 64MB player (which now comes with headphones, by the way, unlike the 32MB version). So far I'm very impressed with it.
Rating:
Summary: Pass on this one unless free!!
Review: I received this unit free as a promotion with Windows XP. Not much to complain about since it cost nothing, but functionaly it leaves a lot to be desired. The interface is very basic, and my unit often just shuts off with no explantion after a song ends. Very aggravating when running or working out! Sound quality is very good but the 32 MEG of resident memory is barely enought to hold ten songs. Upgrading to an additional memory card is pretty expensive and probably not worth the investment unless you have, or intend to have, additional components that can also use the memory card. Spend the extra money on a real good player. If you can get the Rio One for free - go for it, but plan on replacing it after you have grown tired of it's poor functionality and limitations.
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