I think the main difference is support for complex applications (lots of services) and running in your own AWS account. We actually have a few customers who hav

I think the main difference is support for complex applications (lots of services) and running in your own AWS account. We actually have a few customers who have been using Heroku Review Apps and their application has outgrown Heroku and they were bummed they were going to lose that functionality and were now faced with having to build that themselves. For companies that are just starting out or just have simple apps we think our Free and Professional plans are somewhat competitive (albeit it a little more work for now) with Heroku but we don't have the growing out of it issue.