I just finished playing the first level on this, and I must say I am astounded!
I never expected much at all, especially as it is still technically a beta, and I was running it on an X5, not the best Axim for 3D performance. While the actual game screen was rather small, and due to the dark nature of the game, you end up with the Axim 2" from your face, the graphics were brilliant. OK, not PS2 great, but certainly better than a lot of games designed for the PPC platform.
Anyone who has yet to try this, should really make some space and time to give this a whirl... especially the make space part... 18MB for the pak0.pak

oh well... my 512CF card arrives next week :)