I have customize 2.0, summerboard, and poof all installed, work fine together. Just in summerboard you have to choose customize as your theme in order for customize themes to work.
you have the new caterpillar? How is it? I had the free one and deleted it due to issues.
The Caterpillar are really cool! You can customize some wild things here! Try it out, - I think they have 3-4 days trial. One of my favorite on this app, is the calendar function on the "login" screen! I also think its a really cool thing the Caterpillar are inside your settings menu..