There are a lot of golf putting aids out there.
More than a few people have asked us "What is the difference between the Perfect Plane and the Putting Arc?".
We want to clear the air on the differences between the two putting boards.
They're actually very similar in function. In both cases, the golfer putts on an arc. Despite the fact that our product has a straight panel, the golfer still opens and closes the putterface naturally as it moves back and through, as it moves off the ground. This creates a natural arc and keeps the putterface very square through impact. (They can also force a straight back, straight through by manipulating the putterface, but we'd argue that this isn't very natural.) The Putting Arc actually exaggerates the motion of the arc, so there's not only a natural opening and closing of the putterface, but also a bit more extreme inside-to-square-to-inside path. Many argue that this keeps the moment of squaring the putterface a bit harder to achieve.
In talking with our own PGA Tour Rep, he really prefers the Perfect Plane, and Tour pros are echoing this sentiment, because the SKLZ Perfect Plane is so lightweight and easy to carry while being extremely effective.
Hope this helps.