I say it's all hogwash...Work on your swing, get fitted, and buy yourself a solid set of clubs and you will be fine. I think little things like grip size, set up, grip, tempo make a bigger difference than these gimmick products.
Get your putter out 3 times a week and take 100 putts on your carpet in your living room from 10' into a cup and you will notice a difference. Take a 7 iron outside and take 100 swings a couple of times per week and it will make a difference. Muscle memory is a beautiful thing.
That said, if anyone tries these bad boys out and likes them, please let me know...