Definitely! Postgres.app is awesome, but this is kinda targeting a difference use case (I'm one of the postgression authors).

This is really meant so that you don't need to run PostgreSQL at all locally. It adds a small bit of overhead, but makes it much easier to run tests locally, on a remote server (Jenkins, Travis CI, etc.), and doesn't require any scaffolding code to create a db, etc. It just works :)