Well, not very stable for me. Started new game, 3 crashes while trying to rearm soldiers for first mission. Missions itself loads and run well, aliens are moving much more now it seems, looks promising. Then crash after score screens just before returning to geoscape. Reloaded, crashed again. Started another game, different mission, CTD at victory screen again.
I was using or messing with combat shields (yay btw) while most CTDs occured, it may be something with that. Did you guys used them and finished some missions fine?