I've been using Let's Encrypt since they opened to the public for every site I control.
I was not happy with Certbot because of the complexity in getting it to work without root access (which I really don't want to hand out to everything that asks for it, even if they are trustworthy). Out of the box, Certbox seemed easy and automatic. If you didn't want to use it in exactly that way... less so.
This is actually my 3rd attempt at writing a blog post of my Let's Encrypt setup, as I was never happy with the bulk I ended up with. Now that we have
acme.sh, lets try again!