I've been a paying Salling Clicker user for a year now, and I've just participated in the Clicker 3.0 beta. And I can tell you this: Clicker has always been an excellent, outstanding application, but with version number 3, it has become even better. The 3 release has virtually no bugs (believe me, I've been looking for them for the past two months), and is prettier, more user-friendly and more powerful than ever before.
Add to this the fact that there is no other application for OS X that does the same, and you have an app that is not only well worth the money, but a *must-have* for any OS X user with a supported bluetooth device.
And, for those of you who haven't tried Clicker before, do so! It offers so many ways of controlling your computer remotely, and it might even change the way you use our computer entirely.
In ten years time, I'm sure there will be many practical and powerful extended computer-usage solutions like this one, but right now, there's only Salling Clicker...