This plugin supports more wordpress features than any other csv importer that I could find (custom post types, custom taxonomies, custom fields).
My only request would be that the plugin author add some hooks to the source code! I have been working for hours on customizing the formatting of the data that gets imported, and have been able to do almost everything using really roundabout hook methods. I'm on the last task I need to do, and it turns out I will need to edit the source code of the plugin. A hook to filter the post before it's inserted, and hooks before and after the import would have saved me tons of time.
Otherwise this plugin works great!