@Mike H. I tried out the wifi on the SJ4000 and it looks great on my s5 active, but it has a fairly long delay. About 500ms +/- so you'd likely crash if you tried to use it for FPV. It also only had a range of about 120meters with clear line of sight and 80meters between walls. Other than that the video quality on this thing is great, it's not too heavy, but it still has that "quality built" feel in your hand. It really does seem very well made. The screen on the camera itself is not very appeasing, but what can you expect when it's so small. It comes with a wide array of different mounting pieces of various types. (Straps, clips, hooks, screw-ons, clamps, double-sided tape, velcro tape, cable ties, a small steel safety cable, and on and on.. It also comes with SJCAM logo window stickers for your car as if you wanted those for some reason lol.
I'd say it's great for video for a wide range of purposes, and good for wifi if your needs don't require real-time to be right on. On a down note for our hobby, most of the mounting hardware is a bit bulky and heavy.