A feature list would be nice. One reason you might want to avoid Amazon could be that you're competing with Amazons other business, so using their AWS would be a bit weird, not that I think Amazon really care.

Option and competition is good, and being able to buy into a well managed hosted Postgresql is really appealing if you don't have the resources to manage a database installation yourself. Currently the alternatives for Postgresql is really expensive. EnterpriseDB have a nice offering, but it's really expensive.

All this of cause assumes that databaselabs.io isn't just two guys with a server in their basement.