How much security with captcha ist needed?

[symptome]

There are plenty of people, which don't register because they tried to enter a captcha and failed ... and leave.

What have you configured for your users?
- with captcha?
- which kind of captcha
- which kind of security-level (rotation, color ...)
- ...

Thanks!

Marcel

[Dismounted]

You could use the "Question + Answer" system in 3.7, or NoSpam! for 3.6, they both achieve the same and is much easier to decipher than CAPTCHA.

[SEOvB]

I hate captcha and refuse to register on sites unless its a must have site (like vb.org)

I suggest using the Dismounted's suggestions, or even not using one at all and just verifying email address