I've created a Custom Post Type - Reviews and a Taxonomy - Review Types to support three categories of reviews. In the Suffusion Custom Types config panel, I've chosen to Inherit styles from: Post. This seems to be working fine when reading a single review post at a time.
However, I've created a Reviews page and a WP3.0 menu with the Reviews page at the top and the three review types I set up as subitems and configured the main navigation bar to display Reviews as a drop down with the three review types as submenu items. This works too - I can drop down Reviews and choose one of the three categories and I do get a page which displays matching Reviews. The only problem is styling. Unlike with posts selected from categories (on my site, eg. under Blog, Photo Equipment) which use styling which shows post styling with each post listed, on the custom post lists, there does not appear to be any styling being applied.
When I inspect elements on the page which lists posts by category, each post entry in the list has the corresponding Matched CSS Rules of .post, div.page etc. But, on the custom post/taxonomy page listing reviews by review category, each post entry doesn't seem to have any corresponding Matched CSS Rule.
Using one of the dark color schemes, posts are in a black box on a grey background for categories. But, for the custom posts/taxonomies, there is no black box. I've attached a screenshot: