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One of the best things to happen to the internet. We started working on our product a year before Let's Encrypt and in the early days onboarding new customers was a nightmare. This is because our product required a domain to work and we spent lot of time hand-holding customers to purchase a certificate and set it up. After Let's Encrypt, this has never been a problem.

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Wanted to add that after the dns-01 challenge went live, it has become even more awesome. Many customers saw opening up port 80 as a security concern for their firewall.

DNS challenges are great for internal services too, where you want server-to-server communication to be encrypted but the servers aren't accessible over the public internet.

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