FWIW, I've bought several action cams at this point, a GoPro, a weird no-name Chinese cam, a couple of 808s, two RD32IIs, a Sony Action Cam, an SVC200 (off brand, the one I still use over all the others), a Contour Roam, and I can't help thinking one or two others I've forgotten. None of them have ever failed on me.

The GoPro is the only one that has actually ever exhibited bugs - and they were bugs, the company confirmed that this was not just my unit, but they also insisted that though they saw this often, it was "always caused by people using crappy cards" - I was using the SanDisk Ultra10 that they recommended. I had about 12 microSD cards at the time, and they all worked in absolutely every device I owned - except the GoPro, which would only work with two of them. Also once formatted in the GoPro the cards didn't work very well, if at all, in anything else, until I could reformat them.

One card got so screwed up by the GoPro that my PC wouldn't even recognize it. I finally found a point-and-shoot camera that I had that realized there was a card though it couldn't read it either. I formatted the card in that cam TWICE and finally the PC would recognize it, then I formatted it in the PC and it finally was working again.

So it didn't fail, really, but sometimes I'd get home and find out it only recorded 2 minutes of video before shutting off for one stupid reason or another. The worst was that in their loop recording mode, if there wasn't some minimum amount of space free when I hit start, it would make the "start" sound then just shut right back off again. Once it got going it would loop record - deleting old files as the card filled up, but it wouldn't do that at the start, so I had to keep taking the card out and manually erasing files, or just formatting the whole card, to get it going again.

I wound up selling it because it's useless as a helmet cam if you can't turn it on and count on it having recorded a traffic incident.

Here's a good review of the SJ4000:

Techmoan - Techmoan - The SJ4000 Action Camera*Review

There's also the wifi version there. Here's the M10:

https://www.youtube.com/watch?v=5tMhb4t-hPE

If I was nervous about buying any cam it would be the GoPro. I don't worry about the others because the likelihood of them having trouble is so low, especially considering their costs.

EDIT: I went with the M10 last night. It's $20 cheaper than the SJ4000 and it's not quite as ugly. It doesn't have WiFi, but I've owned 3 cameras with WiFi and apart from playing with it for 5 minutes when I first took them out of the box, I have never actually used WiFi on one of these cameras.