Well I've run Preds for years, and the X10 is by far the strongest and best car they have ever made. In fact I would go so far as to say it is one of the strongest, if not the strongest 4wds currently available.
The gears last forever. I have had the same set in mine since I got the car, thats a whole indoor and outdoor season and they look like new!
Also, the whole transmission is guaranteed, break it and they replace it! See here:
http://ttechracing.com/transmissionguar.html
I will admit the car had a few niggles when first released (X10), but TTech jumped on those and irradicated them faster than any other company I have known! They have also been developing new parts for the car this year at an impressive rate.
Cheers,
G