I have them on everything they make them for, not regrets either. No special wrenches needed and the price is right.
I bought a set of those for my erevo and it seems no matter how hard i tightened the nut the outer piece would rotate and loosen the nut. I lost the nut probably 3 or 4 times, but at least i found the aluminum outer piece every time. I just found these adapters frustrating.