I got a Keychron K6 last week, and I mostly really like it. My only two gripes so far:

1. That backlighting is super-dim. I don't need my keyboard to be flashy and ostentatious—in fact, that kind of annoys me when I see it—but it would be nice for the lighting to be slightly brighter. As it is, I can barely even tell it's there.
2. I guess maybe it's the matte finish on the keycaps, but I have found that I have even a tiny amount of grease or oil on my fingers, it is immediately apparent on the keys. It's not like I'm walking around with dirty hands all day, either.