The problem i have always found with these things it they are built for one height/build of golfer who has the low point of the swing very neutral. Personally had more success with using alignment sticks to ensure ball position - distance from the ball is the same every time and build a pre-shot routine around it.

I agree with Brazeley. Practice with alignment sticks. You will develop a repeatable set up position when you are on the course.

Deno