My husband, my housemate, and I were glued to the screen in near silence for an hour. We all enjoyed it... a lot, but we were rather contemplative and soft-spoken once it ended as we gave our initial thoughts.
Since I promised this before the end of the weekend...
I enjoyed it. It's not my favorite Moffat episode (Blink still wins - but honestly, I don't expect much to ever top Blink), but there are scenes in this episode that I absolutely adore.