I sold a ton of them last season, no one has mentioned any problems with any of them. I haven't really asked anyone, but when I see them, no one has mentioned any problems.
I'm sure they are like anything else made, every now and then there's a 'bad one' but of the ones I've sold, nothing yet. Good Luck !
--------------------
az guy aka: R & L Bowlers Pro
rlbowlerspro@cox.net
www.rlbowlerspro.com