Timer started, here’s what I did:

1. I opened www.nitrous.io and signed up for an account. That was basically instant.
2. Clicked on “New Box”, chose the platform (right now they offer Rails, Node.js, Django and Go), gave it a name, selected a region and clicked on “Create Box”. Provisioning and starting up the box took around a minute. It opened with a window in the browser that contained a file explorer on the left, a text editor in the middle, and a console in the bottom.
3. A “git clone” in the console pulled in the sources from GitHub in a few seconds.
4. A “bundle install” pulled in all the dependencies, this took around a minute.
5. A “rake db:migrate” set up the local database.
6. “Rails s” started the local server.
7. And finally, a click on the “Preview Port 3000″ menu item opened a new tab in my browser, pointing to the right URL show my existing Rails app.

All this took less than 5 minutes and I was ready to go. A few further edits, running rails commands, migrating databases again, previewing changes, all that worked like a charm. And signing out on one computer and quickly signing in on the other preserved all the local changes and I could continue immediately.

Again, I’m impressed.