Hi
Yes, I have given feedback to them...both positive and negative. A couple of years back when I went to Asia I booked business on the way back but then I had to re-schedule. As business was full for the next 5 days I was moved to Thai economy and I thought it was a bit much to pay like 25000 for economy tickets. So I complained and I understand that they were playing by the rules. But it was more the tone they answerd me in that annoyed me. One of the replies I got was "well, if you choose to switch to Thai economy class then it is your problem".
On the same trip I had problems with my TV screen and as I was annoyed by the case mentioned above, I also complained about this and got some compensation.
When I went to a Radisson SAS hotel last fall I asked for an upgrade in advance and was told that I already had a good room in my category. When arriving late at night I got the smallest room I have ever had, the internet connection didn't work etc. I did send feedback to the hotel and they at least did admit that I had not really recieved the best room in my category. But I didn't get any compensation even though they seems to advertise "100 % Guest Satisfaction Guarantee"...I was not 100% satisfied to say the least.
But I have also had many good flights with SAS...when flying to Asia in June I did upgrade to business with EB points and that was great :-)