I have an EE 1.6.7 implementation running 3 sites through MSM. The most important of these sites is going through a revamp with a lot of code changes. It relies heavily on the Gallery Module and currently uses the Forum Module, though we are likely removing that functionality.
Given that I plan for this site to continue evolving over time, I feel that the latest code-base will give me future flexibility. I’ve created a dev-version of the sites, so I suppose that now wouldn’t be a bad time to bite-the-bullet. But what’s it going to take to move the galleries and php-heavy templates to the new version. I’d imagine there will be some serious leg-work here…
-Tim