I guess it would be useful to divide the discussion between tournament tennis ball performance (1-2hrs use), of which a lot can be said, and typical amateur usage. I hope to get about 6-8hrs out of a can if possible, and thereafter, used balls go into my serving practice bucket. With that latter category in mind, I have found that Dunlop Fort All Court last the longest with very consistent and high bounce. Most other balls either loose a lot of bounce, or become bald, whereas, the Fort retains its felt and decent fast and high bounce for years. So for me their slightly heavy feeling at first is worth it. The other Philippines made balls like Dunlop AO, ATP, Slazenger Wimbledons are fairly similar and perhaps a bit nicer straight out of the can, but they lose their felt more over the longer run.