Honestly oskar, using software such as PT3 or PAHUD is legal for most sites (not sure if it's illegal for any). And the reason people use it is because online you are lacking some information that is otherwise available in a live game. All the information is available if you were to go back through your HH and write the stuff down and do the math yourself. The program just does it for you then presents it on screen in the form of numbers. That still doesn't mean you will pwn poker online if you use it. You still have to learn how to interpret the information, and still combine them with any other reads/information you have on the villian.