I answered this same question some time ago. I didn´t like the service. However, I flew yesterday from Helsinki to Stockholm in a DC-9-21(!) and I think that was better. Ít´s a short flight (only about 40 mins) and in my opinion that was the best service I have ever got from SAS. There´s still much to improve.
By the way, SAS is going to retire the DC-9-21 in about six months. I recommend you fly this plane before its gone! They are flying short flights with them, so it shouldn´t be too expensive to try it.