As per Ken's review, I had serious problems with the controls not working correctly. I really like the fit and (unlike Ken) don't mind the control system (just takes a little getting use to), but I find that after a few months of use that the controls first become ‘sticky’, then fail to work at all (or, more accurately, probably become stuck either in or close to the circuit-closed position). So, the clicking the ‘pause’ button once will trigger multiple connections which results in multiple ‘previous track’ commands being sent. Once it gets entirely stuck, you're totally out of luck, as it overrides the power on/off control, meaning you can power it up, but can't actually turn it on. Very frustrating.
It's a pity, as I really like the feel of the headphones, and their stability when running (hence the 3 stars, as opposed to 1 or 2). I've actually bought 4 pairs of the things because I really want them to work, but, maybe not again after my last pair only gave me a month of service before going down the same path as earlier pairs.