CVS -> SVN -> Git

Has anyone managed to succssfully import a Subversion repository that was initially imported from CVS using cvs2svn using fast-import?

It looks like cvs2svn has created a rather big mess. It has created single commits that change files in more than one branch and/or tag. It also creates tags using more than one commit. Now I come to try and import the Subversion history into git and I'm having trouble creating a sensible stream to feed into fast-import.

I'm trying to use fast-import because git-svnimport creates a incorrect repository that is missing files and even whole directories (I suppose this could be due to the confusion from cvs2svn), and git-svn is a) _way_ too slow, b) doesn't do merges and c) munges the commit comments.