My friend bought me one for the 360, and it broke within 2 hours of playing with it. After reading some reviews, I am not even going to entertain the idea of getting this POS replaced.
The nob in question that broke from my avenger was for the X.
The extension nobs seem NOT to hold there shape when you set them.
The foam of the B nob seems to be hold in placed by some cheap adhesive that gets sticky after a few hours of playing.
I would definitely not buy this, and reading online it seems that the owner of the company is one that does not deserve anyone's money.