The keyboard has swapped Super/Alt (Windows/Alt) on the windows layout which is so annoying. I hate spending money on hardware so i'm living with it, but i curse the engineer that burned the prom every day.
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Edit and if i switch to the macOS mode. The right alt-gr key is not mapped correctly.
I use my Keychron C3 in Windows mode because the macOS mode ain't right with the bottom left corner keys.
Maybe placement of Control/Option/Command aren't similar enough to the MacBook Pro keyboard for me.
Been meaning to figure this out and fix it... swapping physical keycaps or remapping in software or replacing the keyboard...
The physical slide switch on the Keychrons is a net negative for power users who use a KVM between Windows/Mac/Linux because it would wear out quickly and isn't replaceable. It's more sensible to have switching between layouts by keypress combination.
I've got 2 that both run QMK firmware, so maybe the non-QMK ones can't do that, but at least some can.