Can't blame WGT for introducing this. After all, how many have said they use their own version of this by either tape, ruler, etc etc....
With it being on the meter itself just makes it cleaner. I too have been using my own method of meter bar increment breakdown. Some say it is cheating but come on its a computer based game, you do what you can to be consistent.
I look at it like a notebook for real life golfers.
I did buy the putter pal, haven't used it yet but looking at it compared to my method of measurement, I have found out that mine was spot on in some parts but quite a bit off on other parts.
For 50 cents I get to create a new way of measuring the meter by using the putter pal as a template.
It will help me when I play at work, can't tape anything to my monitor there or it will be a dead give away that I am not actually working :)