If you came to this blog then you have come to the right place. Spybot is a volunteer program that allows programmers to tailor the program to ongoing spyware threats.
I have used this utility to pick up some of the spyware that my paid subscription spyware sofware could not pick up.
Pros: The pros of this software is that its a free antispyware program. Second its pretty easy to set up. Once you set it up you can then run the update. What I do like about this software is after installation the program will ask you to reboot. The reboot process allows Spybot to scan your computer before your computer has the chance to run the normal software. So if any spyware has been installed it will catch it and you are able to clean out.
Cons: The only con I have seen is that the registry function doesn't seem to work to well and can sometimes lock up your computer when your installing it. Mostly with older computers. I normally skip the registry part and go to the update.
So is spybot a scam? Simple answer no.
If you want a link to the software you can refer to the spybot posting I placed a few weeks back
Spybot software blog