I'm demoing this unit in my car right now, my store is thinking of taking the product line onboard.
I love the XM service itself, sound quality is excellent allthough i find it a little on the "bright" side, reception is far better that i thought it would be, i have only found 1 place where the signal "breaks up" It even worked for me deep in a large parking garage in Harford.
The antenna is a excellent design, i used the simple magnet mount on my trunklid and its stable, and works.
My only complaints are, I HATE jog dials. Sony seems to love them to death, but I cant stand them. I want to be able to directly punch in a channel number, and this unit doesnt let you (do any XM units?) and one minor complant, but its really just due to my setup, there is no true volume control in the unit itself. My stereo setup invlovles all outboard amps, and EQ and active crossover, so id love to be able to directly connect the audio output jacks into my system for the best possible sound. Im doing this now, and rolling to the "line out level" controls in the menu, but there arent enough settings to really use this as a volume control. But again, this is only on my setup, and not with the RF modulator or Cassette adapter.