I flew SAS Charter last summer from Arlanda to Dalaman. The ticket was booked via Apollo in the "Charter Plus Class". Quite surprised when I took out my BP from the SSCI machine to see the letter C printed on it. I was able to use fasttrack with it, but at the lounge it was a no-go. The agent told me that charter flights were not eligible for access, so I ended up paying 200 SEK to use the rubbish Menzies Lounge next door.
Once onboard two rows on the MD-80 were assigned for "faux C". Seating was in front of the curtain, although it remained open throughout the flight. When I asked the purser if he could shut it he boldly made the excuse "we need to be able to see through the cabin" which didn't make much sense to me. The middle seats were occupied but the legroom was good at 34".
We received a hot 3 course meal, prawn cocktail as starter, beef tenderloin with potato gratin as main, and blueberry pie as dessert. Presentation was practically the same as long haul economy extra, and so were the dishes. Alcohol consumption was indeed limited, but a G&T + Bailey's were enough for me (unlike some fellow pax who were boozing it hard).
All in all, I was very pleased with this product. Retailing at a premium of 450 SEK return, it's actually quite a bargain given the good value you get. I would however consider this to be more like Economy Extra rather than Business.