The level of commitment from the Ember maintainers is very reassuring. Especially when trying to pick a client-side framework.

However, coming from RoR, there's a bit of a learning curve due to the lack of a prescribed file structure or server-side setup. So, I've been hacking some components together as a full-stack template for Ember and Node with some nice features like Hapi API, scaffolding & Brunch build tools. Shameless plug: http://github.com/cpursley/ember-wings