I had read some good reviews of this product, but many criticised the connectivity. And boy, they weren't wrong! I paired them with a Garmin Forerunner 645 Music and ran with them three times over the course of over 5 hours. The connectivity was terrible and seemed to follow a pattern. As you run and your Garmin wearing arm moves backwards and forwards, the connectivity seemed to drop out in alternate ears. This was so continuous and so distracting that it induced disorientation and I have to take them out. This would suggest that the receivers in the buds are simply not up to the job (the only way I could get them to stay connected was to run with my hands on my head!) I think there is potential for a good product here.....just not yet. What Jaybird have is a non-functioning prototype with at least another 12 months worth of development required.
I swapped mine for some Jabra Elite Active 65t. I have had issues with Jabra earphones in the past (two pairs - both eventually failed to recharge) so was a little nervous about spending more money with them. However, the Elite Actives have been great - much better sound quality than the Jaybirds and no connectivity issues