Mostly the radio system. I had to have the radio, the XM module and the CB replaced. The radio failed and took out the other components.
The display malfunctioned right away, and was replaced.
The electric shift solenoid failed and was replaced.
All under warranty, but it was a little disruptive to have to bring it to the dealer so many times.
The Spyder RT is a great bike, and I would buy another. For 2012, BRP dropped the color Black. Go figure.
The handling was a little sluggish in the corners, but I replaced the front shocks with Elka shocks, and it made a world on difference.
The seat was replaced with a Corbin seat with back rest. Also a great addition.
Added a rear tail/brake light bar. This should be standard on all RT's.
The motor is strong with two of us always riding. We get between 30 and 37 miles per gallon. We look for non-oxygenated premium gas.