I play in a men's league at my club, and part of the cost includes the club providing new balls for each match. Up until yesterday they always supplied Wilson Championship regular duty balls, which aren't bad, but not their best either. Yesterday we got Babolat Championship standard duty felt balls, which I would guess are roughly the same price as the Wilsons, the club just got a really great deal on them. The Babolats seemed harder than the Wilsons, not so much as to cause any arm discomfort, but enough to be noticeable. My singles match was next to another singles match and all four of us noticed the difference. The matches were indoors on hardcourt, and I didn't notice a lot of difference in bounce, but I'd be curious how they play on har-tru.