I tried a couple of other apps to use my iPad to progress the slides at church (but none were designed for the iPad except this one). The app works to progress the slides, but it doesnt show on the iPad what is on the screen. Instead you have to refresh the slide on the iPad to see what is on the screen.
I suggest MyPoint for the iPhone and it is free. I wish i could get my money back for this app (unless they fix the problem in a future update in which case this app will be far more pleasant to use).
J. Daniel Walker about Slideshow Remote®