OK, well, I decided to give the PS3 version a shot and I'm not disappointed thus far.
The Giant Bomb Quick Look REALLY turned me off, as noted before, due to the constant tearing and the 30+ second load times. The PS3 version, however, has NO tearing and levels (thus far) have all taken ~15-20 seconds to load.
This is in line with what we saw in BCR as the 360 version took twice as long to load and had tearing issues. What's odd is that the framerate in the PS3 version is still above 30 fps, but it feels a bit "off". I wish they would have just locked it down at 30 as it never seems to drop below it. Still, it's not bad and the game feels really good.
This game just feels better on PS3. The bumpers were not great in the demo, but the L1 button is more comfortable here.
edit - Alright, so things aren't quite as rosy as I had hoped. It seems that, once you really get outside, loading points are spaced very evenly. It's very obvious that GRINs engine is incapable of handling large, open worlds. They should have went with MT Framework (had it been available for speakers of English or Swedish). The loading isn't too bad (it reminds me somewhat of MGS3 and MGS4 in how it's broken up), but it still feels like it should be open. I mean, the first encounter outside if amazing as you take a massive leap of faith from a very high building. When you make it down to the ground, however, a couple blocks of the city immediately sends you into a tunnel with a loading screen. :\ At the very least, they should have attempted to hide it ala Mirror's Edge (elevators or something).
The mechanics are really fun, though.