I have a bluetooth speaker and bluetooth earbuds. Both worked fine under Android 4.4, now both stutter under Android 6.
It's too bad, especially since the SRS-X3 was not a cheap purchase. And NFC speaker pairing is all sorts of cool. But music that stutters constantly? The crappiest $2.50 earbuds you can find make for better listening than that.
Both my Nexus 4 and 5 stuttered constantly when paired with a Hyundai i30's head deck. I'm of the opinion that the Android bluetooth stack is not the greatest thing ever...
Less problems with CyanogenMod 12 and 13's stack, though.
