Why use Dragonframe for stop motion?

Wants to make a stop motion, and when searching the net "Dragonframes" often comes up.
Why is Dragonframe such a nice tool for this?

Have been googleing, but can't find any usefull info about this.

It has some really great tools, such as replacing bad shots, etc.
www.dragonframe.com/features.php

If you want something cheaper that is good quality to just get your feet wet, look at Boinx iStopMotion.
www.boinx.com/istopmotion/mac/