I've bought two of these and so far they are good. Can't complain on the sound quality, sound stage and bass is plenty given the IEM seal. Voices are lacking in clarity though. (btw, i'm using spotify premium via an iphone 5c, with quality maxed out). I can't see, or rather, hear the advantage of this vs cheaper (yes there are) bluetooth sports iems. 7/10 Overall. Decent enough.
SlarkinHaven't had experienced the Jaybird X2's but if it is as good as what I have read, then this would leave you wanting. I think these are just Ok replacements for your OEM headsets that come with your smartphone. if you can shell out more cash, then go for the X3's IMO