I like that this program monitors my site without requiring me or any other person at all for login credentials, so it's great! Also we are able use our own domain names instead if using Cloudflare DNS service (which in turn means no more free SSL certificates). There isn't anything really wrong with agent less; however there could be an option where you can add your domains as well but not required by default? Like some sorta premium version would help out here since their prices aren’t cheap already - maybe $10-$20 per year might work better than paying monthly fees over 20+ years while having only one server monitored rather then two-three depending how many sites/domains do they have going through them now?! Just think about what makes sense from both sides first before jumping into something blindly because "it sounds good enough".