These are high quality balls at a fair price. I have used the cheap Penn's, the cheap Dunlop's, the ATP Dunlop's, Penn Marathon's and Penn Tour balls. The Diadem balls are not too bouncy like the cheap Penn's and do not die quickly, like Wilsons, they are neutral and durable. I will continue to use them.

I bought a couple cases and passed them out to all my tennis group friends, so we have good balls for a month. :) I am Mr. Balls. They are decent quality and seem comparable to major brands, try them and see.