Hey Magic:
Quite frankly, I love my 550. On a bike you want good voice commands because you're too busy riding to read a small map screen. I guess if you don't have a radio system that could be a problem. It has nice sized written turn by turn screens to determine your next move. The no name map isn't a problem for me. I also like the MP3 system working with the gps. You don't have to go back and forth to get directions and listen to tunes. Any gliches seem to be accepted by Garmins Tech Support and they take care of them as soon as they can. Programing apparently takes more time but they will stand by their product.
Framemaker