Should I stay or should I go?

My bleg to other bloggers:

I’m pondering a shift from Blogger to WordPress, in part to have more flexibility, more integration with my (upcoming) Yale course blogs, and to have all of my work under a single url. WordPress even has a new Blogger import function.

Here’s my question: Have you undertaken this before, and was it an unmitigated disaster?

I don’t fear losing my Technorati score, or even the Google search links. I do fear chaos and meltdown.