Flint Head, personal experience? No not with the Plats. Seen the results from them? Absolutely yes and I was about as far from impressed as one can be. Extremely poor penetration and it had blown apart on the shoulder of a deer. You call that bullet tough? It's copper washed lead. And not even a tough lead alloy. There is nothing tough about any powerbelt bullet.
Mountain Devil, have you ever taken an adult boar black bear? I've taken many over the years. They are a hell of a lot tougher than you seem to imagine they are. I'm not talking about the 2.5-3 year old average boar taken. I'm talking about 5 year old and above. With bowling ball heads and some serious mass about the shoulders. No they aren't bullet proof and I've taken quite a few with patched rb but you have to be extremely picky about your shot choice and stay off those massive shoulders with them.
If one is asking about a bullet choice for both whitetail deer and black bear, those of us who actually have experience with black bear hunting should be recommending good tough bullets for that just in case moment when the only shot a person has is a shoulder shot. You don't recommend a sub par bullet for an animal that can kill you.