The best thing about Trustzone was that it has certificates for more than 500 different websites in multiple countries with all sorts of domains such as.com or other extensions like *.co.* etc., which makes managing your certs extremely easy! It didn't have any cons at this time but I think they should be able to create their own custom domain names so we can use our favorite TLD's instead if having them registered by default (like com).
They are quick service providers who offer great customer support via chat window 24 hours per day 7 days week without fail during my experience using trustZone while setting up Cloudflare DNS servers.