I own several sets of phenolic resin balls, they are unmatched in playability in my opinion, the league I play in uses polyester resin balls and boy do they play different to put it politely, to make things even worse, the polyester resin balls I do own are crap even for crap polyester resin balls, I picked up a set of cheap phenolic resin balls thinking they would play close to the polyester one's and they did not, it is a night and day difference, so I found a set of polyester one's on coolpooltables.com, they were sub $50 shipped, got them tonight and had to try them out right? I wasn't expecting much but was pleasantly surprised, no they don't play like phenolic but they did play quite a bit better than I expected, I figure the best way to learn how to adapt to play on different playing conditions is to play with different different balls on different tables, it's sorta like gambling with better players except you get to keep your $50.