Yep, love my Moonlander - it has really helped with my wrist issues. The only trouble I have is when I have to switch to a standard keyboard (e.g., on a laptop).
I've been using the Kinesis Advantage (and it's kin) since 2000. I can switch back and forth to standard boards without losing speed or making errors. There are several replacement controllers for the Advantage that will let you use QMK and other custom firmwares.
Still worth it though