I tried it. Not a bad looking game engine. Reminds me of a Quake 1 style game. Nothing too special about the graphics. But graphics aren't everything, and I happened to love Quake 1!
I wouldn't say it's without bugs. I was getting black boxes while I played. But that might just be my card. It's just the onboard 945GZ.
I really liked the way it pulls up the menu within the 3D world. That one was new to me.
In my opinion, it's a good one to watch!