I have not used one. Got online, went to the manufacturer's site, read an online review, did some thinking.
Main thing I notice is that noise from your regulator exhalations is really annoying on the video; be nice if there's a way to turn off sound recording.
Otherwise it seems to review decently, considering the cost is modest considering what you get, from what I recall.
Supposed to be a decent mask, I think. Be a crying shame if you bought one & it wasn't a good match for your face and leaked a lot! Might want to consider the returns policy from wherever you buy it.
The option to have a camera handy without having to tie up a hand/wrist with it (or a lanyard) is tempting, though.
Richard.