I have a Rex Zero 1, and *love* it. The factory trigger is extremely nice, albeit DA is on the heavy side, though not too much for a carry/duty style pistol.
I fully intend to get the "battle ready" model that was shown @ SHOT 2017, with the red dot plate, suppressor sights and threaded barrel.
Also, K-Var is now offering the Hogue G10 grips in 3 colors to upgrade the factory plastic panels, without having to buy the special edition Rex Zero 1 with the Hogue knife. Those were the grips on Tim Harmsen's Zero 1 that he ran through Military Arms Channel's torture test last year.