If you're talking about the Gamma 48 Bucket-o-Balls, I bought a bucket and don't like them. They may bounce OK but they feel too soft for ground strokes.Try Gamma permanent pressure balls. I bought a bunch of them for practice and although I don't have a lot of use on them, they seems pretty good, at least when new.
The Unique PLBs have terrible naps. They wear out very quickly and what's worse is that they don't wear out evenly.They look absolutely hideous after a few weeks of use. Plus they feel much harder than regular pressurized balls.They are absolutely terrible. No bounce at all. They don't get worse over time (at least not for a while) however they are awful to begin with.