Review on Improve Your Golf Game With SKLZ Training Bundles - Boost Accuracy And Speed For All Skill Levels, Anywhere! by Bart Schwalbe

Bottom line is my putting has improved. Now I have used a birdie ball mat for the last couple of years indoors over the winter (snow area) Instead of replacing my worn out second one I got this because of the reviews. Seems pretty simple and is but what it has honed is my need to putt the ball through the hole. Now, rarely do I leave a putt short or miss one because of the slight rise at the cup. And this is from 12' in. But the stroke correction for me was impacting the ball and keeping it straight to the back of the cup. My improved stroke is also effective at longer ranges simply by making it consistent at impact.