Step-On bindings are the fastest entry system available — you literally step in and click, with no straps to ratchet down. It's a huge time-saver, especially on cold days when you're fumbling with gloves or sitting in the snow strapping in.
The catch is that Step-On requires dedicated compatible boots with built-in cleats at the toe and heel. You can't use regular snowboard boots with them, so you'll need to buy both the bindings and boots as a matched set. Burton currently dominates this space, though other brands are starting to offer options.
Performance-wise, many riders love the direct feel — there are no straps creating pressure points, and power transfers immediately to the board. The trade-off is limited boot selection and brand choice right now. If you value convenience and don't mind committing to the Step-On ecosystem, they're a solid choice.