I've had a problem selling the reliability angle as our instances of MySQL have never crashed. We have drawn the line in the sand that ALL new apps get Postgres by default, but we've been turned down on funding to migrate all old apps. The belief is that they're "doing just fine". I'd love to see every single one of them moved. I know we'd hear squawking from the few folks that know how to use MySQL Workbench as it is a very pretty interface, but it'd be worth it.