Tl;Dr: Flat EDC flashlights have been flooding the market in the last year or two, most with three channels (white, UV, and laser) and built-in batteries. Acebeam K1 strikes me as a direct competitor to those, offering most of the same core features (compact size, easy carry, and three channels) with a user-serviceable battery. I love the size, brightness, beam shape, and rotary channel selector. I like the price, regulation performance, ergonomics, clip, forward-clicky switch, USB-C user-swappable battery, laser, and UV beams. The build quality is good overall but the switches could be smoother. I appreciate the UI’s simplicity but dislike its lag and mode memory.