Hey Shane, just started using the open source plugin for a project. Works great for the most part. I have it working fine in a fresh install of WordPress 3.0, so I don’t think there are much in the way of compatibility issues.
Anyway, I have a question for you about the premium plugin, Will it support better template integration? One of the problems that I am running into is that the pages generated for the front-end user with your product tries to hijack the site template and integrate its own. The problem with this is that it can break the styles of a site, especially when your site is designed around using a sidebar. I have been able to fix this no problem, but this is a bit annoying to have to modify the plugin to work with the site template.