I’d only consider the Moonlander if you have large hands. I have very average male hands and the Moonlander thumb cluster was quite painful. It’s far away and the keys are angled weirdly. Other good prebuilt options, from close to a regular keyboard to ticks off all ergo features:
- Kinesis Freestyle Edge RGB
- Dygma Raise
- Keyboardio Model 100
- Kinesis Advantage
- MoErgo Glove80
My experience is that once you go ergo, you’ll end up wanting all features, so you’ll save yourself a lot of money by immediately buying a Kinesis Advantage or Glove80.
It's nice for flat keyboards, but not really useful for contoured keyboards like the Kinesis Advantage, Glove80 or Dactyl. I am still hoping that someone will provide a service where you can offer stub versions of common contoured keyboards so that you can try how they'd feel. Of course, the 3D construction if one of the more expensive parts, so I don't know how feasible it is...