I personally HATE the PP thingy, it is a horrible distraction. I've only been playing 3-4 months now, and I miss my fair share of easy putts and make longer ones, but that thing tricks you into a false sense of security.
Anyone with sense in their head can add or subtract power based on the rise or fall of the pin, and the speed of the green, or maybe not.
I am not about making the same robot puts every time. For me this game is much like the real game, it's about feel not about mechanics.
in any case, I WON'T EVER be using the PP.
regards,
Palatius