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Any experience? Recco's?
Hmmm, tricky. I thought that thr GoPro did support one, but I am not sure how. I know that the Contour could be modified to use an external mic, but that means doing some drilling and soldering of your own, so it's hardly stock.
According to [url= https://www.dcrainmaker.com/2016/09/garmin-virb-ultra-30-review.html ]DC Rainmaker[/url] the new garmin Virb Ultra 30 works with a bluetooth mic.
Most GoPro models can, but you need a 3.5mm adapter cable.
eg http://www.chainreactioncycles.com/gopro-hero3-3-5mm-mic-adapter/rp-prod91497
Also means you can't use a waterproof housing, you need one with holes in the side (skeleton housing).