I bought mine originally purely for presentations. On whole it makes the presentation look very formal and professional, and because I use Keynote the audience is amazed by the slides.
I have recently purchased an App called Sofa Control which extends the use of the remote to mutiple applications that come with Mac. Without Sofa Control the remote only works with a select few apps (iTunes, Keynote, iPhoto etc). Now it can operate PDFs in Preview and control various other apps.
Yatz