in response to if you need to use it then quit - good players don't need it I say bullcrap
I consider myself a pretty good player, and with this I incorporate anything that can help keep track of the 100's of thousands of hands I have played over the years, especially when it comes to other players. most sites if you stay at same level you will run across a lot of players you have seen before and a lot you have not, if you keep notes on the ones you have played via the poker client, then that is no different, and I think you should keep those notes. but as far as players you do not know, its good to have poker-edge so you know if they are complete maniac or a shark, before its too late to find out on your own. plus it helps when looking for a loose game or a tight game. if you do not use this software for any other reason than you cant afford it, you are kidding yourself in thinking you can be as good as those that use it. I once told a co-worker of mine who told me he played to read one of my books I own, he said "I already know how to play poker", then he invited me to his game and I clean house! Don't kid yourself.