Well, one very major one is lack of non C usb ports.
Second, for 99% of what I do, that touch screen bar will do nothing, and may even be a hindrance (booting into Linux, the F keys select tty's)
Gotta buy adapters to charge iPhones and iPads.
Gotta buy adapters to plug an external monitor into it
Gotta buy another cable to charge my phone.
Gotta buy an adapter to plug my camera into it.
Gotta buy adapters to use 99.9% of USB sticks
Gotta buy adapters to plug an SD card into it.
Plus, I actually like the fact that the Surface Book is a souped up convertible. The keyboards what's been stopping me from buying a Surface Pro 4
So... 2014 MacBooK Pro for sale! With 3 year Apple Care warranty!