Gamershell.com has the demo up with fast downloads (I got 2.3MB/sec), been playing it and...
...What an excellent demo - I played it on the 360 when it came out and was unimpressed because of the strange-ass controls but on the PC it just kicks butt and dare I say it looks far nicer on the PC too
Here's my Screeny Collage \m/
Even though it has vsync (forgot to enable triple buffering but still constant 60fps!) locked it ran very smooth with no real glitches I spotted - I did not get stuck anywhere too like I did on the x360 version!