Got this to break in a few different gloves for my son (1st baseman, Catcher) before Xmas. Works great and helps out a lot. Immediately notice a difference.
One issue -- The handle isn't long enough.
I'm now donning a bandaided pointer finger, as when you grip the handle, that knuckle hits the gloves on the edges with stiching. OUCH!
Can work around it and hold it different (or wear a glove), but the natural hold position is just too close to where all the stiching is.
Make a longer version or find one.
Otherwise, seriously, this really does help break in the glove and I saw immediate results the first day after a few hunderd whacks.
Would have given it 5 stars, but ouch, my finger hurts :-)P
Pros: Easy to use
Cons: Not long enough, you nail your knuckles
Bottom Line: I would recommend to a friend