Not to be overlooked is how simple they've made the process of integration as a developer. You don't need to write any code to integrate with Zapier.

I originally had a skype chat with Mike thinking that integrating with them would be a back-and-forth dealing with our APIs. Nope. We had Ronin integrated within 15 minutes via a web UI. All you have to do is drag and drop stuff around and fill out a few forms. I think this is the coolest part of what they've built.