Delays, poor information, useless website, and more - Choose a different airline where possible.
Flight delays with poor information before finally cancelling the flight (this is the second time in 2 years for the very same flight). Compensations next to nothing (NOK 150 to cover for meals while waiting 5 hours at Oslo Airport is hardly enough for a bun and a bottle of water). Trying to register frequent flyer points at their website is often impossible (sometimes for unknown reasons, other times because an error keeps you from selecting airports with Norwegian characters as æ ø å in it and these airport do unfortunately exist). Booking site fails unless using specific browsers (does not work using Google Chrome).
In summary, it seems that SAS doesn't want people to fly with them, and if that is the case, I'm glad to help fulfil their goal.