I currently race the electric version of the X-Cellerator (probably because I like running things that others don't consider "race worthy"), and in the time I've raced mine, it's been an ourstanding performer!
First off, the stock idler gear needs to be replaced with an idler from a T4 (it's a direct replacement), and the stock tires are not raceable, so a swap is needed there. The stock servo lasted about 2 weeks (I figured I'd run it till it went bad), so plan on upgrading that.
I've been racing the truck with 35W oil in the shocks, along with the stock springs. I love the fact that it uses Losi rims, because they're so much easier to glue tires onto.
I've won my fair share of A-Mains with the truck, and currently hold the stock truck record at the off-road track in Ft Dodge, IA using the X-Cellerator.
Compared to the Evader, Rustler, Sportworks Raven, etc, this truck blows them out of the water
in regards to track ability, and it's the cheapest truck of the bunch. Why every hobby shop in the country doesn't carry this truck is beyond me.
It'll run with pretty much anything on the track with a few inexpensive mods, and only costs $129! If XTM would release a buggy version, I'd definitely be racing that as well!!
Here's a pic of my truck, along with one of my other toys!