Today we shipped Crowdfire which we've been working on since a month. The dashboard is completely written in Ember using Ember CLI and deployed to Amazon S3 keeping it totally independent of the backend.
To give you more context, I joined Crowdfire (formerly JustUnfollow) team in the mid December last year. Our immediate goal for 2015 was to rebrand and more importantly to rewrite the existing web interface which was serving our users since past 5 years.
While starting up with Ember there are bunch of resources on the internet which gets you started with the framework but most of them share only half-truth and can be really painful in learning phase. Ember has a steep learning curve which can drive you crazy while building your real world web application. I would suggest, better grab Ember-CLI 101 ebook and RTFM. These two resource definitely turned out to be great companion while getting my head around the framework.
I'm glad we chose Ember. Our team is having a good time so far.
Ember is a solid and robust for building web applications. Moreover, if you're a Ruby and Rails fan like me then you will completely fall in love again with frontend development while using the framework. It has all the goodness of both with some extra sugar which takes the whole web application development at another level of fun and it does get better with every release. Thanks to the amazing team behind it and the awesome community, IMO Ember is changing the way web applications are built.
Good luck. Ping me on @BilalBudhani if you've any questions for me.
P.S: I wrote a small plugin on Ember-CLI for oh-my-zsh here.
EDIT: If you're interested in learning EmberJS or want to get a brief overview about the framework then, I would strongly suggest Ember 101 EBook by Adolfo Builes. I've personally started with this one and it was really helpful.