Subdomain based multitenancy

I'm working on a project that requires some sort of multitenancy, so I decided to go with subdomain-based multitenancy (yourcompany.mydomain.com) because it feels more white-label than other solutions.

So far I got it working in my local environment and my test server, this is my first time implementing this type of multitenancy and I would love to hear about your experiences scaling or working with this architecture in production.

I'm using Ruby on Rails for this.
Also if anybody is interested in my implementation, I'm happy to write a post about it.