nope i have not. i pretty much never use bluetooth anymore, i have the FSL Zero but what i really used to use was the Sony Ericsson HBH-DS200 and plug in a something with a short modular cable. what really killed bluetooth use for me though was touch screens, not being able to skip tracks without looking.
if i had to guess i wouldnt really rate many of the chinese random bluetooth stuff unless its from one of the known companies round here. i would expect them mostly to be aimed at people who dont really know or care about audio, particularly if they are cheap. this is why i so liked the HBH-DS200 and IEM's with short cables. that way you could use as good as you like with the HBH-DS200 being the limiting factor and the slight inconveniance of the short cable about your neck.