PoolDawg - The Pool Player's Best Friend
PoolDawg - Loyally Serving Pool Players Since 2003.
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Since I'm the worst pool player here at PoolDawg it was up to me to give this a try. The concept is interesting as it does force you to maintain a smooth stroke. The biggest issue as I see it is that the trainer will only hope if you have significant flaws in your stroke. I stroked with this cue 10 times and received feedback via the tool on 3 of my 10 strokes. To get a better understanding for how it works I've included a video demonstration from the manufacturer.
I would recommend this product to a friend.