It's a very interesting piece of architecture. But mostly from the outside, from the inside, I felt like we did more running on the stairs, than looking at the art (but we were running out of time as well, so that probably affected my experience).
Museum mostly focuses on modern art + Munch. If someone is into that, I think it's still a good museum, with many interesting pieces. At that time, on the top floor was a temporary exhibition, which was actually terrifying. I'm a grown woman enjoying horror movies, but that was... something else. So if you are planning to go with kids - I suggest checking beforehand what kind of temporary exhibition is on.