Thats an excellent question Nelson, on re-reading my post I come across as very vague to the benefits of the program and to exactly what it is.
You can cut the size of your XP install disk in half, and the time it takes to install. Basically what it does is give you almost complete control of your XP installation. It's not really a tool for deleting programs. It can also install programs during the XP installation. Firefox, anti-virus/malware, whatever else etc..
It's completely automated, so when done right you stick the disk in the drive and go do whatever. I can understand what it sounds like though. I would lump it in with that group of programs that have that "Not something I really need" thing about them. However, like Quicksilver on mac, which is just an application launcher but absolutely essential to any mac user in my opinion.
-Dev