I have been using and loving this extension for a while now and it is one of the keys to a Pseudo "Multi-Site" solution. The functionality so great I feel it should be a part of Joomla! core. I did have a small issue where the module permissions where not behaving as expected. I used the developer’s forums and within a few hours I had a response, a bit of testing later the issue was solved! I don't normally review thing, but the developer was so great I had to review this!