Very easy to install and to set up.
The reCaptcha get key is very simple to use and I get my keys (development and production keys) in a few moments.
If you have a custom edit template, you may add a line like
In order to render the captcha.
Average rating 4.50 by 2 reviewers.
Lowest rating 4, highest rating 5.
Note: only the last published review of each user is taken into account.