Heroku is a great platform and has come a really long way -- but it could really use some competition. Some of the main issues that would be resolved quickly with competition are:

- it would be possible to have the non-DB part of your heroku app be spread across multiple availability zones.

- worker pricing would be much lower or based on actual CPU cycles used.

- add-on providers would be vetted more thoroughly before getting a spot in the add-on store.

- they'd reopen the #heroku irc channel for informal support