I've filled in a few for M and S, doesn't seem to help them realise what lots of people think, namely that a lot of their clothes are dowdy. Given up doing them now!
I seem to be inundated with requests for these. I don't mind the basic feed back of Ebay, etc. but today I was asked to spare 15 minutes to fill in a series of inane questions about my recent mobile phone purchase. The questions were so waffly I gave up. Surely the fact that I've stayed with that provider (for donkey's years) shows that I am fine with it, otherwise I would complain!