I have the QCK XXL now. It's AMAZING. Well... the Roccat Hiro is a bit smoother for glides, but the QCK gives me more precision.
I did Battlefield 4, Doom 2016, and OSU.
Yesterday I moved from the Avior 7000 on to the G403, which already was a great improvement. Now with the QCK XXL, everything just clicks and really comes together.
Also: yes, it stinks initially. I like those smells, but I can image people may dislike by it. But it went away after an hour or so.
The seams of the edges are glued well together, nothing weird their.
Also, this thing is really really huge, 90cm x 40cm. I have plenty space left with a tenkeyless on it.
Some people complain that it doesn't lay flush on the table. But in my case, it is perfectly flat.