As others have said, it does feel awkward to use but the turbo function works well. It wont help you much in Call Of Duty(don not cheat kids!)you could use it in zombies perhaps. I used the turbo function in Bayoneta and it works great. you can fire her gun really fast and its good for keeping enemies back,even on the highest difficulty setting.
I will say though, do not buy it from this seller as you can get it much cheaper form Argos,if you live in the uk like me. Also,there are new turbo controllers out and they are made by Datel,(the same people who make this controller)the new ones retail for about £30. so get one of those instead of this one.