If you subscribe to the Lean Startup learning where the author spent 2 years building out a product and then realized that nobody wanted to use it the heroku +

If you subscribe to the Lean Startup learning where the author spent 2 years building out a product and then realized that nobody wanted to use it the heroku + mongoDB stack makes a lot of sense. It lets a startup to get a product out the door quick and figure out product market fit.