It's pretty smooth and good looking on an actual CPC and a CRT.
I had it running literally back-to-back with the AMIGA version and it is impressive. Yes AMIGA version is beautiful, and has great sound effects. But hats off to the guys, they know how to make 8-bits sing! - Looking forward to the release version.
Those CRTC chips are silicon magic! Shame there are so many versions! Least I have replaced the 'crap' one in my 6128 with a demo friendly one