I've seen some posts in the forums about people who've removed all their files from E+ recently and been happy with the decision. It seems that there may never be a best match boost for E+ as hinted at when E+ first rolled out as that question still goes unanswered. One thing I have noticed though is the files that have lots of Vetta and Agency competition are doing much better now than before the best match shift.
With all that said, it seems that a lot of customers are rejecting Vetta/Agency files in favor of cheaper files. Was curious as to who has made a conscious decision to remove the E+ designation from their files and what the outcome was? Only about 5% of my files are E+ currently, but I'm thinking of ditching E+ in favor of steadier DL's.