To add to issues "they" never told me..
In addition to a drop in productivity during the transition, there has been a significant drop in the quality of my medicine as well. Our office providers have been generally very obsessive about evidence based medicine, have held a weekly "journal club" for the office, etc. In the 12 months prior to instituting the EMR I had personally logged 238 CME hours on UpToDate. In the two months since starting AC, I have logged 7!!! Our journal club time (plus lots more) has all been spent on transition issues. All of this is recoverable, of course, but I sure can't pretend that it did not impact the care I have been giving.