Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
For my needs the fact that this seems ONLY to be 3G is a negative rather than a positive. I'd rather have straight edge.
I keep my iphone on edge at all times except when I use the web out of the home, (And always use wi-fi at home) So for me 3G is not a plus.
However the 3G capability of this unit would be a plus for people who want to leave their phone in 3G mode (so they never have to bother switching back and forth in settings), and whose homes are in a marginal 3G coverage area. Such marginal coverage has a lot of dropped calls when in left in 3G mode.