Works brilliantly, has all the Opencart extendability and if you buy an extension as I did and have problems with it not quite working with Mijo, they fix it for you! Fantastic support and a great product. Tried many over the years, by far the best.
Very cool and fun way to stop those bots. Had some anti-spam on a form but spam was still getting through. Can't see how they'll get through this. The developer support was fantastic when I had a small issue. An outside of the square captcha solution.