So I get that I can do the following with Spectacular

  itsInstance 'length', -> should equal 0

Instead of what I can currently do with Mocha+Chai.js

  item.length.should.equal 0

But besides the different syntax (which doesn't matter to me) what does this framework offer me that Mocha+Chai.js doesn't?

Btw. the above is an honest genuine question. I'm not questioning that the framework has something to offer I just can't figure out what it is from reading the website (the DOM features doesn't mean anything to me since I'm currently writing tests for a library).