Well, it depends what stakes you are playing. The higher the stakes, the more profitable slow play becomes, if, and only if you are an excellent post flop player. The problem with slow play is that you give worse hands a chance to catch up with you, and you can lose a lot of money thinking you still have the best hand after the flop, with an over pair for example. At micro stakes levels though, slow playing is unlikely to be profitable anyways, it's better to put in healthy raises when you think you are ahead, no need to be fancy.