You see they help, but they are hard to get use to.
I suggest getting the Razer Onza tournament edition controller.
It has like built in kontrol freeks that feel the same as a normal controller.
Get them i just bought CQCs. i had fps freeks for a while now i think like 6months. I Smack with them lol. My K/D on black ops is a 5. I don't dash Trap or boost. (I do dash sometimes) But lol yeah they help a lot. Especially if you play halo were precision is vital.
I use them and I admit they do take a little but to get used to but once you do it improves you by a lot, I suggest buying them. Also if you don't like them they are only $10 so it's not that much money lost.