I like zoomies and the Cofly KX- X6 vaguely resembles the Yezl T9, which is my current favorite light.
The Brinyte B28-01 appears well made, but I have little use for large fixed focus lights and I already have a C8.
I might have chosen the Fenix E01, except that I recently found a nicely shaped AAA that I think I can build into a good light Smiling Shark SS-5039 1 x AAA size flashlight, modification notes, Now 3 x 7135 with modes, on a BLF Tiny 10 board., so I am not interested in going back to a boring cylindrical shape.
The UltraFire F17 looks ugly and seems to have no special feature that I like or need.