I bought it, and tried for a while, but never got the hang of it, the DS3 felt better for me.
A couple of reasons for that, the accelerator(X) and brake(Square), are way to sensitive, and not very accurate, you push down half way and its 100%, i tried a couple of times, and the its not smooth. The same with the square button, i mean the L2 and R2 of the DS3 are more accurate. And even better is using R3(or L3 if left handed) as accelerator and brake.
The steering after a period gets worn, and my finger has slipped a couple of times, i need to wear gloves for it....and no! i don't eat chips while playing.
And in my opinion needs to have a bigger radius than 30 degrees.
The positioning of the two features(steering, Accelerator and breke) is very good, but thats all it has going for it.
I still have it, but rarely use it....it also doesn't help that it has a cable.