For a bullet to "work well" it needs to be sufficiently accurate AND it needs to perform on the animal. I've never used powebelts, but I don't need to read more than a couple reports of them blowing apart and not passing through a deer with 100 gr charges to know they are not a bullet I need to try for myself to see if it works. I like a bullet that I can shoot accurately with at least 100 gr of powder AND will normally pass through a deer.
I've had great results with FPBs and Maxiballs, that's all I've ever shot in a ML. I don't shoot a lot, and when something performs I don't mess with it.