I'll admit I don't have a large round count through my TRR8, but so far so good. If you shoot hot loads with light bullets you might have a potential issue with eroding the shield above the chamber/cylinder gap, but mine is just fine (I prefer 158gr loads).

It's surprisingly easy to shoot; even though it's quite a bit lighter than the steel frame versions, the size means you still have a decent amount of mass there, so recoil is easily managed.