We love Medium.com its a great free, high quality place to contribute to and after a while better authors get invited to join their revenue sharing scheme which opens up the potential to earn from your writing.
The site enjoys a very strong reputation on Google and has a huge author base of loyal high quality authors that contribute to it. We have a small area of our own on Medium, which you can find here.
So far we have received a steady stream of focussed vistors from their, they read our articles and if they like what we write, they follow the links through to our web sites and we have a visitors who already likes what we do.
The potential certainly is there to turn these visitors into buying or returning customers, we are working on that approach and are sure it has the ability to work for us.