I raced one of the SB Pro v1 cars for a couple of seasons a few years back. It was a very competitive vehicle after making a few modifications that were listed in the SB Pro FAQ that is floating around in PDF format. The chassis modification made a huge difference in how the car handled. I also put AE B4 shocks all the way around on it. The CVD's wore quickly under the power of a 4.5 brushless system so I also made the change over to the TC3 "O" driveshafts.
As stated the car is a tank. I never broke a part on mine. Just wore out a bunch of parts.