i'm getting a constant 75 fps (which is my monitor frequency) with 4xAA, 1280x1024 and 4xAF on a GF 6800, 2 gig ram, athlon xp 2600.

3impact has 2, maybe 3 weak points:
1. no editors included. it's really an engine, you'll have to know what you do.
2. only *.x model import. it isn't limiting for me, but for some of you this might be relevant.
3. no LOD management, you will have to write your own.

@xXx: how's the shader comin along?