It is very apparent that Heroku has cornered the market on new Rails apps and most people I know don't think twice about running `heroku create <my-app-name>`, especially with the recent announcement from ninefold and their closing down their Rails service.
When it came time to deploy my first ember app I automatically assumed I would use Heroku, since I already had the Rails api waiting in a heroku dyno. Literally the day before I deployed my app I heard a coworker mention how another company in the Orlando area deployed their ember app to a lesser know company, Divshot.
I wasn't aware of their service to deploy static web pages, and also was aware of an ember-cli addon that makes deploying to their service so easily. I had some issues that with getting my rails api url to get included in the config, but once I got that figured out it was a breeze to deploy. The deployment was actually so easy that I have completely discounted the need for heroku and might even transition some of my more popular static pages to the Divshot service.
If you are looking into publishing your first ember app, I highly recommend giving Divshot a try and using the ember-cli-addon.