"Our website was blacklisted and we seemed to be the last to know when gmail started bouncing emails back. our webhost said it was because of an outdated software version and fixed the immediate problem. They recommended Sucuri to us to search the site and check for blacklisting. we were impressed enough to sign up for this as a service. At one point google flagged our site as having a virus (outdated software again) and sucuri fixed the problem without extra charge just as they promised and within a few hours. so we have become believers in subscribing to this as a service in general and with Sucuri's performance in particular."