Spent a couple days attempting to deploy using Rackspace tutorial. Wasn't able to get it to work. I will be taking another look, hopefully deployments have been worked out.
Just a quick note, Rackspace has been notoriously slow with getting CoreOS's latest images up, so we've had to work around that with noting that you have to update your machines first before deploying Deis. They just updated to v494 though so it should be good to go IITB now :)
Awesome experience. It's simple to launch in any AWS environment with their CloudFormation template. We're using it to replace the way we deploy micro services. It's made my life as an ops guy much easier - I truly believe it's the future.