This plugin is great for organizing and finding sermons. It really matches well with the series our church does and helps us keep organized. We have two campuses and use Multisite and it works well in that environment too.
The back-end is 100% WordPress native functionality, works great, and is familiar to our pastors which is a nice bonus. I think the front-end looks best of course on the premium themes offered on the WPforChurch.com site, but I found the templates provided easy to copy into our theme and modify for our needs. If nobody in your church is comfortable with that, there are plenty of [shortcodes] available to put in any page or post.
I also want to note that I appreciate the documentation on the WPforChurch.com site!