We watched both parts on one day. We absolutely loved it.
We are big Harry Potter fans and didn't get disappointed.
The technical effects were just amazing! In many cases we couldn't guess at all how they did it really. It was like magic!
The actors did a wonderful job too, especially the actor of young Skorpius Malfoy. In general there were many jokes and we laughed a lot! At other times it was super tense, the suspense was high, and I did even get startled by sudden surprises of actors.
The setting of the theatre is beautiful, we could see the stage just fine and could hear well.
Definitely recommend!