I have played a couple of these at Thomann, the Les Paul versions.
They play just like Epiphones. Good guitars. Felt comfortable.
I jammed around on the GX, liked the Dirty Finger pickups. Hot, biting tone, didn't like the cleans though. They reminded me of the Seymour Duncan JB. Quite typical of Gibson pickups actually, I always seem to like one aspect of them but just can't live with the other.
Also played the EX, which is basically the same but with an EMG 81/85 set. Not really my thing, don't like those pickups. Still, very cool option.
Some things I did notice that were definite bonuses:
24 frets
strap locks
graphite nut
push pull knobs for coil tapping
The neck was also quite comfy. Very smooth and fast.
May look at the GX for a future buy. I envision a pair of Mules going in there! 8)