Just got the Mirge in and it is a very impressive unit. I had a Sportster Replay. The features on the Mirge are really great with two exceptions. I can't believe that you can't set the unit to come on at a certain time, like an alarm. Also, and this goes for all XM based units I guess is no screw holes on the rear of the docks. I really liked that with the Sirius units. I have an adapter ordered. Overall really nice unit. I can tell very little difference in the sound quality, the Sirius talk channels sound better but music is too close to call.