Peter Kostis

Its unique that you can change the plane angle to match the shaft of your putter. A lot of putting arch type aids cant do that. It also has a piece that helps train the face alignment of your putter which is good. They give you a couple pieces of double side tape to attach a piece to the heel of your putter that slides up against the plane board. Could have designed something better than that. Ive used rubber bands but other than that its pretty good.

This is by far the most useful putting training aide there is. When an entire team can use it, you know it's a good one. With the adjustable lie angle, each individual can setup to the board and work on proper swing plane.

This is a great tool straightening out your stroke. as long as your stroke is straight back and straight through. If your stroke is an arc then this wont work for you.

Difficult to use, therefore ineffective. The guide must be removed after every practice session and then reinstalled unless you own two identical putters.