Let's Encrypt most notable feature is that it's free. It's provided Open Source without the typical upselling efforts of other free products. Impressively, Let's Encrypt was created with the primary goal of making using the web safer for everyone. As a sign of it's legitimacy, Let's Encrypt is supported by Google, Mozilla, the Electronic Frontier Foundation as well as other major corporations and foundations. Fortunately, it's also generally very reliable. Over the years, we have had very few issues securing new sites and keeping them safely encrypted. Let's Encrypt is also widely supported and usually easy to add to a website. Many web-hosting companies offer one-click installation via cPanel.

Having an SLL certificate is essential if you want to qualify for google rankings. Letsencrypt is free and easy to set-up.

The most helpful quality about LetsEncrypt is that it is readily available. On top of that, I don't have to spend a cent on it. I love the apps simplified user interface that allows me to issue SSL certificates to all my domains and sub-domains easily and quickly.