When you install SpyBot Search & Destroy, you are immediately given the choice to update, which is of course all important when dealing with the various forms of spyware that you want to be protected from. Unfortunately, when updating, progress can seem rapid and then stop for no apparent reason, for several minutes before finishing off the job.
Once you get over that small hiccup,
Pros
Lots of options
Powerful search
Regular Updates
Cons
Updating can be slow
Indiscriminate about files it removes