We used bk when I was with the group for 3 years and then switched to git. Been using git for 8 years. I know git, but the ergonomics and basic English semantic meaning of commands is much worse. I have to look up git commands and subflags _all_ the time still for checking out old versions of files to a new file. Looking at tags. Commiting to a new branch, et c. Bk's version of gitk was superior and the usage was nicer. I've used mercurial, svn, cvs, git, and bk. Git is hard, but it is the standard now, so of course I'll continue to embrace it. Just not as ergonomic.