@mos_8502 this post finally convinced me to pull the trigger on a beige C64 Ultimate. It's been in my cart for weeks. But, I really like the idea of making games and tools that take advantage of a big REU (which I guess VICE and TheC64 can also have, so it's not unique to C64U, and folks who make software that uses it can expect a sort of broad set of possible users). It's almost entirely unmapped territory. This demo was another contributor to the decision. https://www.youtube.com/watch?v=RK8U_sS5ld4