Performance is only one reason I've chosen MongoDB for my new app. I actually don't see the performance factor yet as I'm still developing and would see good e

Performance is only one reason I've chosen MongoDB for my new app. I actually don't see the performance factor yet as I'm still developing and would see good enough performance on any number of DB choices. The benefit I am seeing right now is development agility. I'm writing my app in ruby/merb. I created a simple lib for mongodb's ruby driver to give me simple first class object wrappers for my JSON data structures. I do not need to declare schema stuff anywhere. I can also write ruby scripts outside the merb server proc easily without going through an ORM framework. As I have another in-production app also using merb using postgres through datamapper, I have a clear comparison to believe I'm realizing productivity gains with mongodb.