Most of the P2P programs are used to illegaly download copyright material like music and movies and the Forum rules prohibit anyone on the Forum from commenting on ways to breach copyright. There are legal uses of P2P sites of course.
That is why everyone is a bit hesitant to comment.
Personally I don't use any of them, you download stuff that says it is XXXX with no real knowledge of whether what you are downloading is what it says it is. I've just spent quite a few hours blanking and reinstalling an operating system which was running very badly - continually crashing and they had been using BitTorrent. Not certain that is what caused all the problems but the computer was fine before they installed it.