Thanks.

And yep, the idea with these demos is to give a realistic representation of the kind of games I'll be developing, what my engine is capable of, instead of just a silly benchmark, or just 1 model with some effects etc.

The city demo for example, if I took away the flowers and spread the buildings out a bit more, would give plenty of room for a fair few enemies, and more advanced collision detection/AI etc - at 60fps.

Also bear in mind, on almost all PC's that aren't more than a few years old, these demos run at 60fps. So I could of course double the polycount if I wanted to drop to 30 or 40 fps.

I am a framerate whore, I love 60fps, but I acknowledge it's not completely necessary for many games. Mainly driving games and fighting games I think require 60fps. Partly for the response time, and in the case of driving games - the sense of speed is amplified by 60fps.