MS didn't invent the iPhone or the iPad but they sure as hell made a nice device in the Surface Pro and correctly loaded a desktop class OS into it making it an awesome machine. The iPad Pro with MacOS would kill...but Apple continue to push iOS to the masses because we can't be trusted. The iPad Pro specs are wasted on iOS.
We bought a Surface Pro 4 for work. We use it as a tablet based oscilloscope. For that it works absolutely fantastic. Other than this specific use case, it's nothing special. Tablet Apps are terrible and not properly optimized for touch. With a keyboard it makes a nice laptop, but why would I buy it over a "regular" laptop?
Jack of all trades, master of none.