Almost perfect. This is a high-quality controller which is made even better thanks to the Backbone app. It has a nice feel to it, and most—if not all—of the buttons you expect are there. I prefer it to most controllers out there, so to have it on a phone is just amazing. That said, the iPhone 13 Pro is almost at the end of its initial production cycle, and Backbone only fits using an adapter. It's disappointing the controller itself isn't designed to fit the iPhone 13 Pro (especially since it's a $100 controller). The adapter also causes the phone to sit at an angle. It doesn't look good. It was a good solution for the controller at the time, but it really needs to be updated to fit the most current phones when they come out. Apple makes case specs available to manufacturers ahead of time to give them time to adapt their products.