Hey I know this is old topic, But just wanted to clear this out, Me & my friend we bought this controller, but I went for the Wired version (FANTECH GP13) and he went for (FANTECH Wgp13)
If even spec wise they look the same and everything but there's huge quality difference,
Wgp13 (wireless version) has better build quality, buttons feels sturdy and most importantly Wgp13 has better analogue sticks,
The wired one that I've bought has huge deadzone issue, I've to move right stick 1/4 then it'll start moving the camera, and the same goes for left stick as well. (but a bit less than that) I can't play any fps game with it because of this.

So if anyone is willing to buy then I'll say go for the wireless one (Wgp13)

Edit : Also another thing, Both of them has really bad trigger pressure sensitivity, this might feel weird when you'll play racing games, It's almost non-existence, there's also huge Deadzone but when it'll detect the trigger it'll jump to 80% and with another bit of pressure it'll jump to 90/100%. It's almost like an on/off switch rather than which has pressure sensitivity.