First of all - congratulation - Montage looks very promising. I own a Motif and I'm very happy with the sound ... BUT .. I never really tried to program sounds on my own as the UI was so slow. Walking through the screens is/was a nightmare... I would love to hear that Montage got improvements for people that would like to build their own sounds. I think this is also the main reason many people ask for the reference manual - we are all curious how far we can go instead of using Montage as a "Sample playback machine".
UI is very fast. I tried it my self. You can go unimaginably far re: synthesis, in my opinion. I could spend a long time before remembering there's also samples. … I find AWM2 synthesis very fast & intuitive.