This is a gutsy thing to do with a piece of software that has been part of your life for over a decade. Mad props to mpm.<p>Up until Blekko I had pretty much been a perforce user (both at NetApp and at Google) and git was &quot;that weird system you had to use to check in kernel changes&quot;. Blekko used Mercurial and I had no opinion as I had no experience. But over the years using hg at work and then starting up a github account to learn git, I saw the writing on the wall. Hg was the betamax of source code management systems. Clean, elegant, reliable, and not mainstream.