Tried the new Steam patch, first thoughts:
ATI Crossfire is better... but still not working. 44 fps & smooth with a single card, 20ish with dual cards and heavy stutter. On a side note, Cat AI set to high quality seemed to reduce stutter significantly with two cards (and improved performance on single card), though it is definitely still present.
Performance as good, maybe a little better than beta. Managed to push trees to high with no loss of frames. Full screen now seems to work properly, no performance loss. Also the Ubi logo at the start no longer causes my card to underclock and no longer requires deletion/renaming.
'Terrain bars' over water glitch still present (single/dual cards), less frequent. Not seen the weird arrow glitch yet. My joypad has disconnected once or twice mid-flight, which never happened before, but that's probably unrelated.
EDIT: I was wrong about AA, I'm pretty sure it's not working after all, I think it's just scaling better in the true fullscreen mode. Buildings/hangars/etc are still a jaggy mess.
