Rating: 
Summary: irock 400FM works as advertised!
Review: This unit works. It's as simple as that. It works on battery power or with the included 12V adapter equally well. I use it with a Sony mini-disk in my car with great results.I first tried the Belkin Tunecast and Tunecast II with disapoining results. I had to turn up the volume on the mini-disk almost all the way up before it worked at all and then had a lot of interference and fading in and out on any frequency. The Belkin units have good designs and features but don't work for me. This may be due to the area I live in being fairly well saturated with FM stations but the irock 400FM works well on it's 4 available frequencies in exactly the same area and on the same streets. It's a bargain!
Rating: 
Summary: Breaks too easy
Review: Wasted money.... broke within a few weeks. Looks like others have had similar problems.
Rating: 
Summary: Great in theory, but...
Review: When I first saw this little doodad, I couldn't wait to get one. Finally, I thought, I can use my XM radio and iPod in my truck. And for only $25? Turns out, though, that it's too good to be true. While I can now use both XM and iPod in the truck, the sound quality is so bad that it's not worth the hassle of setting everything up. To be fair, I live in a major city with FM stations at 88.3 and 88.9, which pretty well obstructs the useful range of the iRock. I'd say the sound quality is on par with AM radio at best. So I wasted my money...if you're going to buy one, make sure there's a free spot in the FM 88.1-88.7 range beforehand.
Rating:
Summary: Busted after 2 months in the glovebox
Review: Worked okay. Used it a few times. Took it out yesterday and the left channel is dead. Jiggling the cable it cuts in and out. Read this board and found others had the same problem.
Will iRock make good beyond the 90day warrantee? We shall find out!
I see they now have 450FM model that you can set to any of 100 frequencies. That's certainly an improvement - because with the 400FM you only get 4 choices which tend to conflict with stations in my area. The 400FM is usually powerful enough to overwhelm the more distant station but sometimes you get interference....
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