On Friday, US Apple stores will start selling the Vision Pro, the tech giant's $3,499 headset and its first major release since the Apple Watch nine years ago. Vision Pro's release by the world's most iconic device maker is a major milestone for lovers of virtual or augmented reality, who see the technology as the next chapter in online life after the smartphone. Critics acknowledge a definite ""wow"" factor, noting its state-of-the-art image and the joy of opening and closing apps floating in space with your eyes and fingers. However, the headset is heavy, messes up the user's hair, and requires a clunky battery pack. Apple says there are 600 specifically designed apps and games available for the Vision Pro, along with one million compatible apps. ""These incredible apps will change how we experience entertainment, music, and games,"" said Susan Prescott, Apple's vice president of worldwide developer relations.