amazing that all i need to say. it works so well.im someone who thinks training aids are gimicks but thius isnt if you have a bad stroke you will miss a 3 footer everytime with the cube on.but whats best is that you can solve the problems quick.if you have a bad putting round put the cube on hit 10 straight 5 foot putts and you know if your bad putting is down to your stroke.

my advice GET ONE NOW

my average has come down from 32 putts per round to 29 and i have 70 percent gir so the putts im holing are relatively long ones

I will agee, this is a good training tool. Really helps me w/ accelerating the putterhead as opposed to de-accelerating, which is a constant problem for me.