After years of rumor and speculation, Apple finally took the wraps off its virtual reality headset this week. The Apple Vision Pro made its debut at the company’s big developer conference in Cupertino, California. The new headset lets the viewer enjoy a fully immersive experience, or dial in a little bit of their visual surroundings to mix the real world and virtual elements together. It’s an impressive feat of engineering. When it goes on sale next year for $3,500, Apple hopes it will serve as its next big platform for app developers—and the usefulness of the apps that wind up on the Vision Pro are what its success or failure really hinges on.