Just wanted to make note that I am currently typing on MT3 Godspeed with a slight decline instead of incline and it's very comfortable with R5 thumb keys.
From the source you linked, by Matt3o:
> If you instead like dead flat keyboards, the set won’t be any worse than –say– SA anyway.
Again, it's your call, but I don't think you should be flat out stating that MT3 is inherently uncomfortable for any keyboard without an incline, because me and other ortho users are finding it a comfortable profile on flat or keyboards with a negative tilt. Just not with R4 thumb keys.