Experimentation or not, I truly feel sorry for the 1,000s of google users who bounced off of my site yesterday. They must have all been wondering "how did i get here?". Now they will have a negative impression of my site and of their google search experience. I guess progress comes at a cost?
Btw, for us, the worst of the experiment seems to have ended at about 11pm eastern US time - conversion rates of google organic referrals have returned to normal. I am sure the data from that experiment spoke for itself and we won't be seeing that dataset again soon!