When they said all my customizations would be lost. I foolishly thought "they probably don't mean the sidebars, like my links list."
Oh, yes they do.
Anyhow, it's cleaner, and I think the font is easier to read. The whole template is more in the spirit of January's asceticism.
BUT.... I am going to be spending the next however-long reconstructing my FO list and my links. I can't believe I didn't save them somewhere else.