There's someone here who had 3rd gear fail in the middle of a pull (with a GT30) and that always made me wonder how long mine was going to last. But it was still working like new when were removed it ("we" being Citka, Easy19, and me).
I launched it exactly once after upgrading my turbo, then decided to stop gambling with it. A couple weeks after switching to 6MT & R180 & Exedy Twin clutch, I went drag racing and launched it hard over and over. And learned to shift without losing boost. Abusive, but fun.
Now I wonder how long my axles will last.