These balls are really hard, round and fun to play with (white version). I got them a couple of days ago so I can't really say anything about their durability. So far, a quality ball.
Actually not that bad of a ball, but WOW they're fast. I think so at least. They don't really allow for ample dwell time so to generate massive amounts of spin. Ya, I know it sounds weird, and I don't really get it either, but it's just what I observe. They do last a good while, and, best of all, they're VERY cheap: about $2.00 for three balls on average. They're just "good enough" quality, but LOL you can't beat the price. That's really the only reason I would get them... and I don't usually.