I don't want to start a flamewar, but it wasn't an integration; it was a hostile takeover. Heroku was doing just fine without SFDC's interference, and when Salesforce not only refused to believe that employees might have negative opinions about integrating but actively prevented us from speaking up about it, people got rationally angry and left. I remember talking with an architect on the Heroku side about how he felt about all of it, and he told me that it wasn't presented to him as a choice, and senior leadership was convinced that Herokai would see this as a good thing despite his (and others') warnings.