For a long time I traded POT almost every day. Definitely gives you an edge, trading the same thing all the time. Once I defined my prime setups with POT and tested them in sim for a while, my win:loss ratio since I went live is something like 8:1. I also traded AAPL a lot (until its price went above $235), and AMZN, which I still trade sometimes along with some occasional POT.
I think POT and AMZN are just awesome to trade. You can trade small size (100-400 shares) and make some good money. When trading larger size you have to deal with partial fills and slippage.