TBH I use it but not for its intended purpose, I used to use it with guildwars 2 but it simply just doesn't work for all games. So I activate it, then de-activate and close it. This cleans your ram up and is almost like a restart, If I'm going on multiple games in one session I like to use it before switching to that next game.
otherwise it's not crapware it just doesn't work for every game, In Bf3 I used to use it now and again cant say if it helped or not as my spec is pretty high end anyway. It certainly never caused issues though.
It seems to do something. Does Nada on a good PC, but on a laptop or poor desktop, when you get bugger all fps, doesn't help much at all, couple of fps here and there, but I wouldn't use unless sometime was completely unplayable.
it does more good than harm actually, allows you to stop services/programs to free up as much ram and resources as possible for your gaming experience. Its completely configurable so no need to be scared about it, many many people use it and report good results I was simply stating it doesn't work for every game, but I notice its benefits with freeing up resources.