I have used NoSpam only in combination with the default vB captcha for both of my forums and have had great success. I recommend NoSpam to all of my clients running 3.6 on up -- My experience is that spambots are made null&void when NoSpam is installed and used with the default vB captcha.
The vBulletin rip of NoSpam (aka Question & Answer Verification) is 2nd rate in my opinion and should not be used.
Jacquii.
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