Rating: 
Summary: Pass on this
Review: Plain and simple, this thing just does not work. It's one of the poorest FM modulators I've tried. Awful sound quality. Pathetic adjacent channel rejection. Published specs MUST be from fantasy land.
Go with the cassette adapter unless you absolutely must use FM. If you must go FM, don't use this.
Rating: 
Summary: Excellent product!
Review: The iRock works fine for me. I got mine yesterday and put it through its paces -- using a Rio Sport S35 MP3 player and the stock CD/radio in my 2002 Saturn SL1. The first thing I noticed is that if I put the Rio and the iRock together back-to-back in the nook between seats standing on end, so the wire connecting them (as another writer said, this is the antenna) forms a loop in the air, transmission is perfect. Laying the wire flat isn't very effective and is rather fuzzy. (NPR broadcasts at 88.1 and 88.5 in this area, so I chose 88.3 and was impressed that when the iRock is turned on the radio goes totally silent!) The sound is perfectly clear, like I was playing a CD. Yes, the volume of the radio and the device have to be cranked (setting 18 on the Rio, half a turn on the radio) because devices like that were meant for use with lower-ohm-requirement earphones, but it's digital sound so it can handle being raised like that without distortion. YMMV depending on device, of course. I'm very impressed with the product and recommend it.
Rating: 
Summary: Not bad
Review: The iRock! 400 works pretty well, for the most part. I live in an area where there is a very strong station at 88.5 and a weak one at 88.1. I leave the unit set at 88.7, and it works well except when I get close to the station tower for 88.5. The main annoyance, besides static when it happens, is that you need separate power sources for both the iRock and your CD/MP3/etc. player. Currently, the music player is running off batteries and the iRock is plugged into the car. If the iRock is working off of batteries, then when the batteries get weak, the power/reception may get worse, although this theory hasn't been tested yet.TIP: lower your antenna, if you can. I got a LOT less interference/static after I lowered my car attena. Overall, I would choose this over a cassette adapter, since there are less wires to deal with, and cassette adapters tend to break easily. The iRock seems like it will have less problems.
Rating:
Summary: Technically I supposed you'd have to say it works, but...
Review: The sound quality is tinny and weak. I had a hard time finding a balance between how high the volume should be on the receiving stereo, and how high the volume should be on my iPod. If I run the iPod right into a stereo with a component cable, it sounds great. Going through the irock however, just sounded hollow. and that was with the irock sitting right next to the antenna. Take it a few feet away, and forget about it. You could hear audible static on all frequencies. Basically, it came across more like a distant AM station at best. The thing is sitting on the floor of my car, and has been for several months. If I hadn't lost the receipt, I would have returned it.
Rating: 
Summary: Bad
Review: This doesn't work at all. You'll hear only noise...
Rating:
Summary: Good Product--Definitely Worth the Money
Review: This is a good product and is definitely worth the money. It works fine in NY even though the radio spectrum is full.
Rating:
Summary: Little dynamo!
Review: This little wunderkind is a very welcome addition to any car stereo system. I originally bought this device early last year so that I could play my MP3 player over my car stereo. Let me tell you, it sounds great. As long as I've owned this iRock I've never had a problem with it; even if there's a radio station coming in perfectly on the selected frequency, the iRock completely overrides it with no bleedover at all. (And I live in an area where there are sometimes seemingly up to six radio stations fighting with each other on the same frequency.)
The battery life on the unit is outstanding and its small size (slightly smaller than a computer mouse) lets me put it just about anywhere in my car without it getting in the way. I don't even need a completely clear line of sight to the car antenna; no matter where it sits or where it's pointing, it works.
About the only gripe I would have with this device is the power button. It's extremely sensitive; I could swear that once or twice I turned the thing on just by looking at it. Exaggerating a bit, of course, but just make sure you don't set it down somewhere that it could bump against something and turn it on accidentally. It doesn't have an auto-power-off feature or anything, so if it turns on by accident, it stays on until it dies. (I've gone through quite a few AAAs that way...) This one comes with a DC adapter, however (which mine didn't >_<), so you don't even have to worry about that.
Overall, I'm very happy with my iRock, and I'd recommend it for anyone who wants to take portable audio on the road, be it an MP3, CD, or tape player.
Rating:
Summary: irock 400fm fm transmitter
Review: This product is hampered by its' seriously limited range. The device must be w/i a foot of the FM receiver to work with any semblance of any reasonably acceptable listening standard. I must with an unequivocal clean conscience rate this product as unacceptable.
Rating: 
Summary: Eats batteries
Review: This product worked decently, except that it used premium alkaline batteries up rapidly, and would not do well with rechargeables. I ended up putting it aside, and using a C. Crane FMT Digital FM Transmitter instead. That made the irock 400 essentially a waste of money for me. I would have done better to shell out for the higher-end product in the first place.
Rating:
Summary: Engine noise filter issue
Review: This unit has several problems. First, it has a very limited amount of selectivity for the FM station. Second, my unit has a problem with picking up engine noise through the cigarette lighter. This manifests as a loud whirring sound when the engine is running. This sound is absent if the engine is turned off, or if you are running off the internal battery. This second problem is not present on both of my cars, which leads me to suspect that some vehicles have filters in place to prevent the problem. Battery life is nowhere near the nine hours I have seen advertised. Finally, the signal sometimes "drifts". I think that this is because of the mechanical tuner.
I recommend this unit for in-home use. It is more of a crap shoot for use in a car
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