[Finnster]

I didn't ever break one, but I knew you had to be very careful anytime there are phillips head screws into alu. I was worried I was going to strip the head tho. I always put mine in a vice and put a lot of weight down on it and try not to wrench it too hard. Have to be sure to have the right bit also.

The CEN diffs I got were actually worse. I think they used red locktite on some of their screws for a while. I'd take a soldering iron to those first (you can do this w/ the HPIs also.) Even at that, it still a war of whether I was going to break my tool or the screw loose first, as you can only get the screw so hot. Basically I held a constant and strong TQ on the head and just waited for the thread to break loose. Try to force too much and the head would strip. Some of my hex tools are permanantly twisted from those suckers.
They like to mix heads between + and hex on the diffs too. Craptastico.