The xray one is six screws, three on the bottom, the top deck, the front bumper and i like to do the front tower too and out it comes really easy. Its also a lot easier to adjust by sticking a wrench in and tightening/loosening it depending on how you want it. No complaints about the xray one here.
I think the beauty of the TC3 is that no matter what you could stick it on the track and it would always be 70% good anywhere and required little tuning to make it fast.