The Olso Pass is definitely worth obtaining. You have access to most of the museums and public transportation. We purchased the 72 hour option but there is also a 48 and 24 hour option. It will save you money and also save time.
I was on a layover so I had a limited amount of time and mistakenly thought that if I bought a pass online I would be able to zip through the process. I was wrong. Instead I waited almost two hours to get my pass at their tourist office so I was barely able to use it. The other issue was that the only place, and the only tourism office is at the train station, which meant that it was a 30 minute ride from the airport to the station. Was also impossible to get cash from the ATMs at the airport, which turned out to be a good thing. Expensive and wasted my time on line. If you need to use the bathroom at the train station, be prepared to pay.
One of our favourite stops visited during an 11 day Baltic cruise. The pass was perfect for a 1 day stop. We were in port for 11 hours. The Oslo transit system was easy to navigate and with the Oslo Pass we managed to see most of the main attractions.
The Visit Oslo Pass was perfect when my wife and I had about 12 hours to spend in Oslo during a layover on the way back home from our honeymoon. The value was great because it allowed us to ride public transit and enter plenty of the local museums we wanted to visit in this lovely city. We were able to get our money's worth in only a few hours and definitely recommend it.
We used our Oslo Pass to access Kon Tiki, Viking, Folk and Nobel Peace Prize museums, to pay for parking, to ride bus, metro and ferry. Great value and the convenience of not grappling for admission fees. Only problem is that prepaid passes can only be picked up at the Visitor Centre at Central Station between 900 and 1700 unlike the Stockholm Pass that can be obtained at the airport 18 hours a day. Going downtown was not convenient for us.