I like it because it behaves very well within the range of platforms for prototyping. Good transitions, easy to use, really very nice.

It's easy to learn the interface, it's pretty straightforward to use. I like the mirroring as well for quick presentations. Sketch import. Great with handling a lot of screens, especially if you're just doing state to state.

I can quickly pull in wireframes from Sketch or Illustrator, create a prototype, and then have others in company quickly test on their iOS devices.