We are currently testing Sitelock on one of our websites to bring you a full review based on real testing and data.
In the meantime, have a look at these reviews from around the web:
https://uk.trustpilot.com/review/sitelock.com
https://www.consumeraffairs.com/business/sitelock.html
https://www.g2.com/products/sitelock/reviews
