I'm getting to the point where I'm using git-svn in preference to the plain Subversion client for every project I actively work on. I don't use most of the features, but it's worth it just to be able to do
git svn log or
git log -u and see the commit log without needing to ask the server. Remember how awesome it was the first time you ran
svn status or
svn diff and got immediate results, as opposed to
cvs update or
cvs diff -u? This is the natural next step from there.
Being able to commit while on a plane is pretty cool too (I did that last time I flew from SFO-AKL),
git stash is handy, and
git commit --amend is very nice, but
git log is git-svn's killer feature for me.