Ask HN: Heroku Postgres vs. Amazon RDS Postgres

I'm currently running a Heroku Rails app and our Postgres DB has grown to a data size of 50GB, and our DB cache hit rate is at 93%. We're on the legacy Ronin ($200/month) plan (1.7GB) and probably need to upgrade but the next upgrade is the 7.5GB plan at ($750/plan). But we're running this as a bootstrap, so we'd like to save some money.

I notice that Amazon RDS for Postgres is in beta and will likely be a lot cheaper. But I'm wondering if anybody has any experience using Amazon RDS for Postgres instead of Heroku Postgres.

We've got a small team so we don't have any resources for DB management, and that's why we like Heroku. I'm wondering if Amazon will also the same convenience and no-maintenance approach as Heroku, and if we'll be saving significant amount of money or not.

Thanks.