I updated without a problem, but so far the only thing I've done is create a sim. It did fix a problem I was having: when I made a everyday outfit, then changed the hairstyle for another outfit, it would say I was still doing my everyday hair and undo the work I'd done on the everyday outfit and substitute something random.
Too funny on the fixes! I've definitely seen my kitten run through a wall, over and over and over. I think I've seen the dog do it, too. Not really that bad, but nice to know a bug was fixed.