I recently bought this sleeve along with my Surface Pro 3, and I am very satisfied.
The sleeve has a high quality feel. The nylon feels sturdy, without feeling hard or rough. It feels smooth and soft inside and out. The zipper works well, without undue catching or binding. It is padded, so it will provide decent protection, but it is a soft case, and the padding isn't super thick. It should protect well against everyday bumps and knocks.
The inside lining material is very soft microfiber material. It won't scratch the screen, and it also doesn't give any friction, even against the soft-touch material of the type-cover, so the Surface slips easily in and out of the sleeve.
The sleeve is roomy enough that the Surface fits easily with the type cover attached. There is a loop along outside edge of the sleeve that can hold the pen stylus if you don't have it attached to the type cover (I don't). It's a tight fit, but the pen sure isn't likely to fall out. There is also a zippered pocket on the side of the case. The zipper is about a third of the way down the side, but the pocket is open above and below the zipper, so there is a surprising amount of room (though thickness of the items you could fit is fairly limited, obviously).
Overall I'm very happy with this sleeve. Decent protection and a quality feel.