I actually won one of these at a GK outing and have used it quite a bit. I think it is a great tool that gives you the proper line. I found it interesting that the putter comes inside a bit on the back stroke and then also on the follow through because of the angled wall. I find the straight back an... » More

I actually won one of these at a GK outing and have used it quite a bit. I think it is a great tool that gives you the proper line. I found it interesting that the putter comes inside a bit on the back stroke and then also on the follow through because of the angled wall. I find the straight back and through easier than the open face square close face technique. This perfect plane is a straight line and a very useful aid of muscle memory. I recommend it. » Close