I happened to write a mobile app using Exponent few days ago. It was a great framework.

During the course, I joined their official Slack channel and asked a few questions, talked to several Exponent devs who are very friendly and supportive

The conversation was something like this

I asked about a feature that Exponent right now doesn't fully support but there is another implementation using pure Javascript. The dev took his time to take a look and send me a sample repo.

It was a few weeks ago, now I read this article http://fortune.com/2016/08/23/charlie-cheever-y-combinator/

The guy co-founded Quora