I haven't bought any for a couple of years, but the last one I had, broke in a very unusual way....between the bottom ring land and the intake cutaway. Also had one that had a small blob or lump in the wristpin hole. I couldn't use it and it had to be returned. How does a lump or blob even end up in that hole? I would have thought that those need to be reamed or bored to the correct precise diameter. In the heyday of when I ran a repair shop, Wiseco was known for needing to be run a half thou. looser than what the they speified, compared to other other brands of pistons especially in modified engines, because they didn't actually expand more slowly and evenly than other brands of pistons, like they claimed. It wasn't just my finding, but a general consensus among technicians that rebuilt offroad motorcycle engines. Perhaps they have improved.
Wiseco piston out of my KDX 200.