Works great

The plugin works great, but:
– I did have to edit a file in my theme, whereas WP-reCAPTCHA plugin worked straight out of the box
– The plugin settings are not under the settings menu, like for all other plugins, but under a new menu item, a quite obnoxious one at that.
On the positive side, comments don’t go into the spam queue if the CAPTCHA is not correct, as WP-reCAPTCHA does, and thus keeps the database clean of spam.