What's so great about Ember Router?

I’m new to Ember - just started working on my first test project. I’ve read through the guide, watched the PeepCode & Code School videos and skim some slides on Speaker Deck/SlideShare.

From what I’ve seen, everyone has been saying Ember Router is the best thing ever. Mind explaining that to me?

I came from a PHP, Ruby/Sinatra, Objective-C/Cocoa Touch background.

This is probably the best explanation I’ve come across.

TL;DW. URLs in a Single Page App by default. Ember makes breaking the back button extremely hard to do.