Ok, I've had these since the original Kickstarter.
TLDR: They're great if you're not fat.
Basically, the connection can't go through stomach fat that well, so if you're fat and carry your phone in your left pocket (front or back), forget it (receiver is in the right earphone). If you are fat and carry your phone in your left pocket, it will drop out for half a second every 5 minutes or so, bearable. If you are thin and carry it in either pocket they're perfect. Make sure you install the latest firmware, version 3 is great, version 2 or less is bad, and the source of most bad reviews.
The microphone is good in non-windy environments, ok in noisy environments, great in quiet environments.
Otherwise, the charge lasts at least 2hrs at max volume, they sound great, much less visible than apple airpods with much lower 'wanker' factor, they're waterproof, you can load your own music in them and swim and/or leave your phone at home. Touch controls work great, fit (for me) is great.
The negatives are, the heartrate and O2 sensors that were promised are useless (software lets it down, not hardware), the case they fit in to recharge is giant and metal, and its fiddly to get them to sit flush with the case and recharge, unless you spend 20secs getting it right they might be flat the next time you go to use them.
However, no regrets, lost these for a year and still worked when I recharged them, great support, great longevity, no bluetooth pairing issues, would purchase again if I lost them.