Well... sorry for the nag, but I think that's too short for an answer.
Though it's true, I would like to try out some things on my local testing environment... and a mock upgrade (so a template in development actually grows around the content the site is going to have later) is - imo - an essential part of it.
I would like to try doing an upgrade locally... so I installed the migrator component (= Joomla part) but then, for 3rd party SQL-elements, one is recommended to install "3rd party migrators" into the component.
And here, I don't get any feedback from CB... obviously, I assume a plain dump from the #__comprofiler... tables will suffise. But then again, if you want to be user-friendly this plugin is not redundant at all. (or at the minimum some explanation on this)
Anxiously waiting for Joomla 1.5 to go into production phase... and for CB 1.1 to be ready to migrate just along...