I've never tried the Zuca Pro ultraluggage, but the heavy traveler in me responds to it in an absolutely visceral way. It's got a built-in seat and internal, stacking drawer-like sub-luggages, and it fits into overheads. If only I hadn't sworn off two-wheeled luggage for four-wheeled spinners, I'd seriously consider this thing.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.