I've been a little more impressed with Derby (<a href="http://derbyjs.com/" rel="nofollow">http://derbyjs.com/</a>) than Meteor, as it's based on similar concepts, but plays well with the rest of the Node/JS ecosystem (for example, it uses npm), has server-side rendering of page content, and can scale to multiple servers.<p>I have to admit my only hands-on experience so far has been a little tinkering, though. Who's actually written stuff with Meteor, Derby and/or similar frameworks, and what were your thoughts?