Quick summary: when it works it does a pretty good job. But thus far, it hasn't worked every time.
As some of you will know, the SOLOSHOT3 was delivered very late. I ordered mine in August 2015 and received it last October. It is still missing some features, but it can perform its basic functions right now.
I ordered the Optic65 so it could zoom-in while surfing. Unfortunately its range is 600m and where I normally surf I am 1km off-shore... But recently I have been surfing at a beach and it worked OK. But the Optic65 provides great depth-of-field - the islands that are way off in the distance look quite close.
I tried a bunch of land-based tests - set it up, went walking and running with the tag and it followed me 50% of the time. When it didn't I would either track but without me in frame, or it would just day dream and film random stuff.
The other day I took it to the beach, set it up, went for a quick surf, but it did not work - but I did get some good footage of other people ;)
And finally, I tried again and it seemed to be tracking me OK, so I stayed out a little longer, and it worked. And it did a good job - see below.
Unfortunately, you get to see how you really surf... I was on my Speeed for he first time in a long time (my brother in law wanted to try it), and the surf wasn't great, so with the excuses out of the way it did track me even when moving "quickly" across the wave.
One big downside is the tag that you put on your arm (that the camera tracks) has the tiniest display, so unless you have very good eyesight you cannot tell if it is tracking or recording you. You are supposed to press a small "+" button to start recording and press it again to stop. But I knew I would lose track of whether it was recording or not, so I recorded everything. (And their editing software hasn't been released so I used another program.) The sound is just what the camera heard - so turn your volume down...
The battery life is not great either. I took an external USB battery and used it to recharge the camera and tag.
Anyway, I hope to try it more over the next few days so I will add more comments later.