The device is otherwise much the same as before, with the ability to track props (or even your own body) and 4.5 hours of battery life when you're untethered. You have no reason to upgrade if you're happy with your existing Vive setup, then. This is really for newcomers, arcades and diehard enthusiasts who were always going to buy the latest gear -- it's just good to know that HTC is making this gear available relatively quickly.