Proclaim is multi-platform and has a cloud-based component, such that it's easy to create service presentations at home and then use them at church. All that's required is that the Proclaim software is installed both places and logged into the same group.
Overall, it's pretty easy to use and many things are obvious to find and use. It has enough customizability that it should be usable by both small and large churches alike.
Service content is editable in a freeform editor, with changes instantly previewed on slides to the right. It's super easy to see how changes affect what will be displayed to the audience.
The biggest drawback is the song database and organization. You can't organize songs into different collections, nor can you see all of the songs in your database in one place in order to do organization, cleanup, etc. When you pull in a song to your service order, you are editing that song everywhere it might be used, so you have to be careful about changing verse orders, words, attribution, etc. Additionally, song titles must be globally unique within the church group. In other words, you can't have two songs named identically where one is a congregational version and the other is a choral version. You have to differentiate somehow via the name.
Faithlife has indicated they are working on a major upgrade to the song organization features, so I am hoping that this gets much better in the near future.
Editing backgrounds, adding images, and editing smartmedia is a little confusing at first, so it really takes some getting used to. This aspect of the product could be made better.