problems?
 

are there more problems with mini z's than xmods?

All RC's have their problems, but I'd say the Xmod is more prone. However, Mini-Z's problems can be more costly. It's also a lot easier to get the parts you need the same day from a Radio Shack dealer where as most Mini-Z parts need to be ordered online. If you're wondering which one to get and money is not a factor, the choice isn't even close. Mini-Z's smoke the Xmod in speed, control and fun.

do they have any record of steering problems like car pulls to the right while accelerating?