Don't get me wrong, I love their balls. They have superior bounce and pace, and they're quite easy to see on court due to the bright color. But they pop on me way too quickly. I bought a canister of Grand Prix and two canister of Championship Hard-Court. These were perfectly sealed and appeared to be in exception condition. First day I open a canister of CHC to practice against the wall, and about 3 hours into playing 2 out of 3 balls pop. I don't know, a hole got in there somehow and the ball went flat. Second day, I open a new canister. Again, 2 of the balls went hole/flat on me. I practice against a friggin' wall, and I don't even hit that hard. I hit with about moderate power (semi-western FH, extreme eastern OHB if it even matters), and very rarely do I unleashed 100% on the ball. Yet of the 6 balls that I purchased, 4 of them died on the first two days of being exposed outside the canister. If it even matters, I personally walk around the court making sure there are no sharp objects/whatever lying around. The Gran Prix were superb balls but lasted me a week. To be honest, I can't afford to be buying a new canister of balls every few days. This is ******* me off. I hate Penn balls, but they never simply die on me. They lose bounce, but they never pop. I feel like Dunlop balls are the equivalent of natural guts strings. If you want the most superior playability and feel, you're gonna have to lay down the cash, even the fun lasts a few hours.