I own a Surface Pro 2 and a Surface Pro 3, and use them for portable music production, live performance and field recording. They are by far the best system for such use. It's a tablet, with the touch screen (or stylus) except it can run a full version of ProTools with all the plug-ins and VSTi's you could possibly want. Full USB connectivity for audio interfaces, MIDI controllers and peripherals.
If they made a Macbook with a removable touchscreen, it would be close, but Apple seems more intent on having every pixel in the world. I remember when Apple really catered to musicians (except for their slow adoption of audio driver standards). Now, they cater to people watching cat videos. At the moment, there is no device close to the Surface Pro for this purpose. I don't believe this niche is enough to sustain the Surface Pro by itself, but I'm glad to have them right now. And I hope someone else out there is paying attention, which is why I post a comment just like this every time the Surface comes up on Slashdot.
Not that there's anything wrong with cat videos.