I hit two bugs in rapid succession but other than that had a pretty bug free experience aside from occasional crashes.
The Break of Dawn has a bug when hang in the sky while talking to Meridia. She suddenly drops you when she's done talking to you and you crudely die when you hit the ground before the teleportation triggers. Once I found tgm, it was ok. At first I thought she dropped me because I told her to stuff her religion.
The Great Lift at Mzinchaleft has a bug "locking up", trapping the Dragonborn in a repeating cycle of arriving at either the surface or Blackreach. On a console you must press all buttons and on the PC keep hitting the favorites menu until it loads after which you wait awhile and close it.