Nice looking extension - it installed, connected to the solr server and indexed new and existing posts and pages without any effort.
I am a little confused about the category facets though. When I have a category selected, and there are child categories with posts attached to them, the child category posts are not listed. Only the posts that are *directly* attached to the selected category are listed.
With faceted searching (multi-faceted or not) the idea is that you start with the largest possible set of posts and reduce it as you (a) add new facets from other different category trees and (b) drill down to lower level (i.e. towards the nodes) categories.
Is that the way it is supposed to work, or is that something this extension does not yet do?