I think you really have to understand that at its heart, Let's Encrypt is not about free certs as much as it is about automatic certs. If you just want a cert, definitely use an established provider. But a year from know, LE will be making this a "set and forget" thing, which is how it should be. LE is NOT a painless way to get certs for legacy infrastructure. I found this out by using it for an elastic beanstalk hosted site. I just wrote about it at https://go-to-hellman.blogspot.com/2015/11/using-lets-encryp...