My wife and I are going to the store tomorrow to see the demos, but we've already decided to upgrade our SP3s to SP4s. We both fell out of our chairs when we saw the display separate in the second Surface Book video, and we really want it, but... tablet is just as important to us as laptop, and 3 hours battery life (surely less in the real world) with the display separated just won't cut it. I figure by the second or third generation they'll have more battery in the display and it'll be a no-brainer then. Maybe it will even have a kickstand.