Hmm, didn't realize they allowed you to use local development tools. Question for people who are using Heroku: Is it fair to call it a tool for beginning Rails developers or does it have benefits for "advanced" Rails devs? This blog post is definitely making me take a second look at the service.
I guess it depends on the need, i was able to hack in 2 proof of concept app some 2 months ago with it. which later end up as production apps.
I've been trying to suggest heroku to a friend of mine to use it to introduce ruby/rails to his students since the amount of time to setup an environment is really crazy and sometimes incomprehensible for new students trying to learn ruby/rails.