The PSN Store updated late for some reason, so I just finished playing the demo.
Fantastic. I'm really impressed with it. I'm even more excited for this game than I was before. Training was kind of a pain because those buttons were impossible to identify on my SDTV, but once I had the controls more-or-less figured out, it was loads of fun.
If I can swing it, this is a day 1 buy for me.
@dreddz: I noticed some screen tearing too, but only in the opening cinematic. After that, it was fine.
EDIT: During my second playthrough (I don't know if I've ever bothered with a demo more than once) I noticed some more tearing. I hope they fix that for the final release.