Awesome service so far. The Continuous Deployment flow is awesome with deploy previews, CDN, custom routing, Automatic SSL from Let's Encrypt. The SSL can be improved to be true automatic without a provisioning step (first hit issues a cert)
It can be easier. We've used https://github.com/GUI/lua-resty-auto-ssl to provide SSL provisioning on the fly at my previous company for our customers` custom domains. This also means that there is no downtime at all when they change the DNS record from their old servers to the new one
