The only one on the forum I know has any GoPro experience is springman.

I have been watching the action cam issue for  a while - I think the price and features are getting to a point where I will buy something before too long.  The last few years of development appear to have made the cameras far more user friendly.

Sound quality is a big issue and the internal microphone in any of the action cameras does a poor job because it is out in the wind stream, inside or out of its' waterproof case.  A decent external mic can be had for less than $20 on Amazon.  Most of the brands are made by the same Chinese company but they do the job.

Placement of the mic is critical and I wasted most of a riding season finding a place that suited me.  Anywhere in the wind doesn't work very well, even inside my front jacket pocket it picked up too much wind noise.  Behind the windshield it picked up too much valve train noise (on my Guzzi) and very little exhaust note.  I finally settled on clipping it to the bottom of my jacket, centered in the back and I got a nice exhaust note without the noise but while moving about I pulled it loose and it was eaten by the spokes on the rear wheel.  Now I clip it to the center belt loop on the back of my jeans and carefully arrange the wire inside my jacket and up to the camera with some slack so it won't pull out.  This way works fairly well but sometimes my jacket starts flapping a little and it picks that up, but it is good enough.

I've used more than one brand of camera and have had very good luck with the Gitup Git2 Pro.  Wide angle, adjusts to light changes quickly, can accept a 64 GB card, accurate color and everything is adjustable if you can figure out how to move through all the menus.  I bought mine during a flash sale for about $120.

The best tip I have is to buy a tiny little bubble level.  I attached one on the top of the camera with double sided tape and leave it there all the time.  It really helps in aiming the camera so that the horizon is level and evenly split in the middle of the image.  It is a lot of fun to review the videos later, especially in the winter.  I even bought some Sony video editing software and cut and splice and ad music to some of the footage.  It gives me something to do on long cold winter nights.

springman wrote on 04/12/16 at 09:07:28:

Springman, I belive you can bluetooth it to your phone and see what it sees. Just clip your smartphone to the handle bars and viola!

Only reason I haven't purchased one of the Chinese Go Pro knock offs SJ4000 SJ5000, is because they do not have external mike plugs or capability.
They are really cheap and have close to Go Pro quality for about 1/8th the  cost.
After I get moved to my new work area, I plan to be doing some online youtubing stuff and will most likely buy one of the SJ's to see what the quality is and how to use one for videography.

I believe you download the go pro app

here is the go pro sight for "how to" on most of their camera's

https://gopro.com/support/articles/how-to-pair-the-camera-with-the-gopro-app

old_rider wrote on 12/30/16 at 14:53:01:

I've seen vids with something similar I think they called it motovlogging or something silly like that.
I don't think the world needs to hear what I have to say while riding in traffic  

I'm going to check out some cheap knockoffs.
Here's an interesting example of using a dedicated field recorder just for the audio
https://youtu.be/kk6Dws0fvDk
He used a Zoom H4n