I downloaded the AppZapper trial, and it works very nicely. The drag and drop interface is very quick and easy, and the program seems to succeed in finding files related to the unwanted program and getting rid of them.

The price seems fair, but I hardly ever seem to have the need to fully uninstall a program, simply because I don't try out a ton of new software. So, for me, it doesn't quite seem worth the money, but if you find yourself frequently trying and deleting new applications, this might be very useful for you.