The sound in general is a bit on the harsher side, in my view. Hard to get silky pads out of it. Never tried it, but I suppose it must be hard to mix SM One.
Can't you change the end-of-session behavior of the demo? Currently it's a hanging note, not exactly ideal
The scales of the envelope sliders seem very exponential or whatever it is. Often the critical setting takes place near the top end of the scales, which makes them a bit fiddly. Not least because the travel is rather short.
On the keyboard, it's hard to see when black keys are played, while white keys clearly change their color.