I had one and had nothing bad to say about it in general. The RTR black plastic is pretty durable, but also quite flexible. The ESE white plastic is much stiffer but more brittle as a result. I had the RTR version.
I sold it to a mate just recently as I wasn't using it.. I ended up buying two AE SC10 factory team kits instead and am using those to race with, rather than the Blitz.
Bashing - Blitz RTR
Bashing and racing - Blitz RTR, Blitz ESE with RTR chassis and RPM arms, AE SC10 with RPM arms and bumpers
I have the ESE and love it. *knock on wood* Nothing has broken on it but it's not for want of trying :evil: as I bash and jump it heaps.
The bottom damper cap on one damper has popped off a couple of times but that's no biggie.