Well, I am going to enter a another set of headphones in the bluetooth mix. The Synchros S400BT (aptx).
You all know, I am a Sony MDR 1RBT MK2 fanboy, and my Harman Kardon BT were my gym and workout phones..Both of these push aptx, and my phone Note 4 and Tab Pro 8.4 both have apt x.. Now, I don't see it mentioned a lot but if I am not mistaken, to get the benefit of aptx, you need to push hi res/flac files through your source. I have my Note 4 with its 128gb sd card, crammed pack with flac files.
As I was saying my Harman Kardons BTs were my workout phones(My wife has a set too)..Through the course of working out, and doing all kinds of rough things with the Harman Kardon BTs, they have taken a beaten. They still work, but the straps and parts have got broken. The comes from me dropping them, taking falls. Be that as it may, I checked with Harman Kardon, and they are standing behind the Harman Kardon BTs, and will replace them. However, they the Harman Kardon BTs have been discontinued. So,they offered me the Synchros E50BTs. I checked, and they DO NOT HAVE apt x.. I did a little more checking, and found that the Synchros S400BTs do have apt x. Their customer service told me that they will send me the Synchros S400BTs..Two pair..
Only glitch is, I have to send the two pair back with the original boxes and all accessories. Don't have the boxes, and half of the accessories. Going to call them to day and tell them that, and see what happens.
These will be my workout, running and roughing it phones. My Sony MDR 1RBT MK2s is my flagship and my jewel..
IMO, I don't see anything out there that beats the MK2 BTs at the price point I paid, and they give up the goods..