Our traffic improved 20%, that's two improvements in a row now but I have to say this was a much smaller improvement for my site than I expected.
My niche has hardly changed since 6th November so if they hadn't said there'd be a refresh on the 21st I would have put it down to normal seasonal fluctuations. It's normally much more obvious.
Saw some ranking changes on the 29th however which brought more traffic. I often wonder if Panda runs much more frequently than we realise. I've seen the stats of other sites which show huge falls at a non-panda date followed by a huge leap at an official panda date.
How confident are we that google tells us about all Panda refreshes?