Due to some interesting circumstances our church has been able to switch to Mac for our Presentation duties during Sunday services.
We have used Easy Worship with PC for probably last 10 years.
It has had its problems and plusses.
It is easy to use, volunteers can pick it up and operate it with minimal training.
Logical and well ordered.
Its limitations is in its ability to play media. While we could get it to play WMV files okay, it struggled with Quicktime, Mpeg and other file formats. If the video files was large and processor intense, we had issues.
It was not uncommon for Easy Worship to crash, despite having it installed on various laptops and PC's, including one whose only task was to run it.

We have used Pro Presenter for one week, but I think it will perform better, as a Mac program should. All video files, including windows ones, and large, processor intense video files, play beautifully on it. It also has a crisper, clearer picture on the screen, with some lovely transitions and formats. It looks better.

One serious limitation with Pro Presenter is its inability to import Powerpoint files unless you have Ppoint for Mac Installed. This wont be a problem for me, but I can see a time when a visiting preacher will bring a ppoint file along, and we will have issues. I have Keynote installed, so you would think with Keynotes inbuilt ability to import Powerpoint, Pro Presenter could import Ppoint files, but it can't. Seems wrong to have to install a Office product on your Mac! Moving away from Windows based OS is one of the attractions of Pro Presenter.