Well, what can I say?
Tried SAS IC in Y for the first time a bit over a week ago, and was very satisfied. Nothing special, except a very nice crew, that seemed like they really enjoyed their job, and that made me enjoy the flight as well. Also, SAS is one of quite few airlines to offer a premium economy service, and I really enjoyed the bigger seat, where I can sit next to someone without feeling uncomfortable (I'm slightly overweight..). Upgraded with miles to C on the return (CPH-SEA/SEA-CPH), and really enjoyed that as well (though I must admit, I was more impressed with the step up from M to Y, than the one from Y to C).
All in all, I've always been very satisfied as a passenger on SAS IC flights, and in all three classes.