I've got the X4 which is similar, just without the rear cam or wifi. I find that Vantrue's video quality is pretty good, but I prefer the Viofo A129 Pro because 1) the doublestick tape mount is much more solid and doesn't introduce the same vibrations as Vantrue's longer suction cup mount and 2) I get buffered parking recording.
I prefer the Vantrue for a quick rental car dashcam setup where using a suction cup makes temporarily mounting/unmounting much quicker.