Premium headphones usually come with an expiration date. The battery fades, the ear pads flatten and crack, and a few years later you’re shopping again. Sonos is trying to break that cycle with the Sonos Ace Ultra, its new $449 flagship. It pairs longer battery life and stronger noise cancellation with ear cushions and a replaceable battery. We spent close to a month wearing them on a daily commute between New Jersey and New York City to see how they hold up and whether they make sense outside a Sonos home.