I abandoned laptops for convertibles/tablets with an HP 2710p in 2009, and the Surface Pro 3 is now the end of a two year quest for a full time laptop capable tablet. Between the last two updates, battery life in sleep mode is terrific (no more drain) and network connectivity is solid. Although I would have loved a 512GB SSD, I have to admit that my 1TB OneDrive, coupled with 256GB onboard and 128GB in the mSDXC slot, should be ALL that any sane person should need.
As far as performance is concerned, the SPro 3 is the best ultrabook I've used yet (including a Dell XPS12, MacBook Air 2013, Yoga 2, and Acer Aspire V7), and the forthcoming dock should make it the perfect desktop replacement. Microsoft has hit a home run with this device, even if the general tech press won't recognize that.