i use the gmmk pro myself and i really enjoy the knob. i ended up buying a second one just for work bc they weigh a ton and i wasn't going to constantly lug it around
* The metal shell has very sharp edges, which has damaged every surface it's been on.
* The quality of the cord is very low, and is terribly frayed now
* The silver accents on the edges appear to be very thin, and have worn off and made the whole thing look dingy
I don't think I'll buy another of their products. Maybe the GMMK Pro is better, but it's also a lot more expensive.
Anyway, thanks for the info! Unfortunately the GMMK PRO doesn't seem to have the layouts I prefer, but I'll keep an eye on future products!