So WinRT and SurfaceRT struggled. My sister bought one and liked it though.
In a lot of ways the Surface is a laptop with a detachable keyboard and the OS and eco system is still based on that. Apple wants their eco system to develop from a clean touch OS base into productivity areas. Having said that, they are really lagging in this area and the momentum has shifted well away from iPads in the business world.
The Surface might beat the iPad pro, but I do wonder if the either will be the future of productivity compared with a laptop and a tablet.
I picked one up on a curious whim, and often use this language to describe the Surface 3. It really does act like a laptop, all the way down to going to sleep while I'm playing music, and hibernating during periods of inactivity.
My brother-in-law will probably love this iPad Pro as he is a financial advisor and spends a lot of time getting quotes from websites, so he loves his iPad. He hates his MacBook Pro as he says "it keeps too many things open and doesn't shut them down properly" which is indicative of not understanding how apps close on OSX (or bothering to learn), and an interesting side-effect of the 'freeze-dried' app states on iOS for multitasking. I would have thought that OSX > iOS (I find using the iPad frustrating as it is like using a child's toy with no filesystem access) but for "real world" users it is obviously different. Enlightening to me anyway!