Building with Firebase was always a bit of a pain since I had to use at least two services (Firebase + S3). This is really great. I've got a dozen or so static page apps that could use this right away.
Non-SNI device support & naked domain support are awesome features. I’d like to see a bit more customization around the routing / DNS still. It would be nice if I could host different versions of my app on different subdomains (staging, etc). Apex hosting is a nice touch too. Overall this is a great entry to the PASS space.