It depends on the troll.
If it's a success troll, then he's good.
He can lure you into thinking that he's good, he may help you sometimes, but, he'll fuck you over someday.
If it's a fail troll, they won't do anything but "troll" you, which you may avoid with the correct words.
imho, I'm a successful troll

I'm a real human being, I won't act saint on the internet, nor act like a douchebag.