Since G's UI change average page views per customer are down 18%.
Our conclusion is that because the ad's are not as clearly differentiated as such, users are more confused. This results in lower quality traffic. (for us).
Visitors from Overture (average page views) are unchanged. We are shifting more of our ad buying to Overture.
Haven't noticed much of a difference but traffic from AdWords does seem to be up in some cases.
I've seen a decent drop in total impressions over the last 5 days for many accounts. Conversions, CTR, & CPC are all similiar, just less searches preformed. (Conversely, we've seen a rise in impressions from OV).