Join Date: Feb 2008
Location: Paso Robles, Ca, USA
I have had the stock 550 for about 5000 miles, absolutely no problem. My understanding is that the BMW branded unit does not support XM radio, which is a deal killer for me. I have a 4GB SD card in mine for music along with the XM receiver/antenna, so my music choices are just about unlimited. I have mounted the Zumo and the XM "puck" on a Big-Mak shelf, which allows operating the Zumo without having to look down like you do with the BMW handlebar mount.
The LCD screen is great, I really doubt that the screen on the BMW unit is any different or that the unit is some how more resistant to vibration.
The 550 is really an entertainment center with a GPS component. Much improved over the Nav III I had on my previous ride (R1200RT).
Paso Robles, Ca