i've been shopping around balls a bit over the last year. i play 5.0+. i find wilson balls are good at first, but fade quickly and penn balls seem to split quite often. these dunlops hit nicely for about 30 minutes of solid baseline games, but then become fluffy marshmallows. i don't think i'd buy them again, but their not bad.
All balls lose a bit of bounce after play begins. I am just a club level player, but lesser balls need to be replaced after 2 sets. These Player Elite balls keep their bounce through the entire match.