I bought the MA750 (without mic/remote) after reading about it here. Like warrenpchi, I am experiencing driver flex. There is a crinkling sound on both sides when I insert them in my ears. I contacted RHA about it. I'll have to wait and see what they have to say. They do sound great though from the few minutes I used them. The driver flex is the only downside so far.
Edited by earplug - 9/27/13 at 5:36pm