(Git's model is restricted enough that it can't very successfully act as an interface for Mercurial or Subversion. Mercurial can do both very well.)
I had to use an SVN repository this semester at Uni. Only once did I actually check it out in SVN—then I decided to chuck that and use hgsubversion. That made me considerably more productive than the other students... especially when the SVN server ran out of disk space: I could still commit and push later, while they had to wait. :-)
When I have to deal with Git repositories, I typically use Mercurial, also.
The conversion tools work well, but bringing 200 devs to a new system can be a major PITA.
Author: (no author) (no author)@...
Date: Sun Jun 8 ... 2003 +0000
Standard project directories initialized by cvs2svn.
git-svn-id: ...@1 ...
(Game development shop with art assets in SVN)
I'm no brain dead svn fanboy.