I bought one and when I first got it it only showed a blue screen with "no signal". Tried reconnecting all the wires a few times and got a bit of flickering video, but eventually packed it up to return it. Decided to try it once more the next day and it was working.
I used it on the lake this weekend and was quite impressed. Picture quality was very good, better than I was expecting, and battery life was ok, about 5 hours. It would have been more but I forgot to unplug the led lights when we weren't fishing and they ran for 6-7 hours without the camera on.
One negative that I noticed was with the screen. It has very good picture quality but only when viewed straight on. From even a slight angle the screen looked darker with much less contrast.
Other than that it seems like a decent camera for the price.
I have until the middle of March to return it, will update then