I sold my original Xugong v2/Pro but I had one more spare frame. So I decided to build it with parts of my F450. I do not have gimbal ready so it is back heavy right now.
Naza-M Lite with original firmware was working fine although GPS hold and overall flight was not so smooth as when I flashed it with 4.02 firmware. Part of that could be also the props. I switched to DJI originals after test flight and they seem to be much better. Almost no jello with Naza V2 fw and DJI 9450 originals.

The frame was from Ebay and cost 90AUS.