The sixxasis controller is great. It did what it was supposed to do and was very light and conformatable.
This controller is not much different at all to be honest. The vibration function is much weaker than the duslshock2 for the ps2 and im quite dissapointed by that.
People are complaining that it's heavy... Are you serious!? This thing is a tiny bit heavier and hardly noticable when you're playing games. In my opinion, the extra tiny bit of weight makes this controller better than the sixxasis alone - never mind the feble vibrations.
Overall it's a good controller. But not worth the retail price of 34, or 39 pounds in some stores.
Don't get excited about this as it's not anything to be excited about.