I just played around with this and it is pretty cool. A few of the highlights, to me:
1) Changes are pushed real time to your mobile device so you don't need to refresh or reload the app
2) Ability to have some pretty complex logic for interactions
3) Very quick to get something up and running to show someone a proof of concept
4) Ability to store values for use throughout the prototype
Anyways, thought others might enjoy this!
fintech spy