XM SkyDock for Apple iPhone and Apple iPod Touch

XM Skydock-for Apple iPhone and Apple iPod Touch....

http://www.myradiostore.com/xm-radio-receivers/skydock.html
Anybody use one of these in a truck?My only concern is the use of the RF transmitter..it does NOT have the you hook onto the Anteanna like many of the others.
It seems to be pretty neat...letting you use your i-pod/i-phone as a music player with the built in transmitter...and also letting you listen to satalite radio...with the built in reciever...using the I-pod/I-phone screen to control it...charging it, and supplying a mount.
Anybody have a quick review?
Unfortunately, a re-bate that was $30 just ended.