I would say all genres are available. Most are dentro styled demo's though. Some really short, some very long. I only saw 1 ST style megademo on the falcon from what i think was a french crew. Forgot the name and really the screens weren't impressive, but amusing.. prolly funny if i could understand french. Almost everything is 3D (including texture mapping, gourad shading, etc.).. and in my opinion there are too much tunnel effect demo's. There's also quite a lot "fake" demo's (senior dads, spice boys). Wich are funny and not all that bad
If you like the demo's on the ST and/or amiga then you'll like the Falcon ones as well