Surface Pro 4 and Surface Book are still more cost effective than Apple offering and you don't need masking tape to try to integrate like with the Apple solution.
Surface Pro 4 12.3" i7/16GB/512GB/iGPU/pen + Type Cover $2330
Surface Book 13.5" i7/16GB/512GB/dGPU/keyboad/pen $2699
MacBook Pro 13.3" i7/16GB/512GB/iGPU + iPad Prosumer 4GB/128GB + Smart Keyboard + Pencil + Masking tape $3416
Surface Pro 4 12.3" i7/16GB/512GB/iGPU/pen + Type Cover $2330
Surface Book 13.5" i7/16GB/512GB/dGPU/keyboad/pen $2699
MacBook Pro 13.3" i7/16GB/512GB/iGPU + iPad Prosumer 4GB/128GB + Smart Keyboard + Pencil + Masking tape $3416