Meteor has always seemed interesting but the fact that it is hosted makes it a non starter. There's too many scaling questions that a marketing site will never put me at ease, I'll need to see some solid case studies and ideally a company sponsor of some sort dogfooding it.

Maybe for an MVP? And even then, I have a hard time justifying it over mocking my data and using something like angular to speed up front end. Maybe I'd use it in very narrow use cases.