Alderton Music seems to have good demo..
here the ME-80
https://www.youtube.com/watch?v=KmTVAqUYGQA
going to look for there GT-100
here it is
https://www.youtube.com/watch?v=ZXR4Rk-Cb7s
I like these guy as the tend NOT to play over the talking

I like the screens on the GT-100