It's NOWHERE near the Samsung one, BUT it's not bad. If you want something thin and that has the slim keyboard like the stock case (a-la-Surface), then these type of cases are NOT it. The keyboard is a lot chunkier compared to the Samsung one, and while removable, the case itself is thicker and heavier (not by a lot). Just like the stock case, the option you link only has one viewing angle, and that is always an issue for ME (especially if you want to use the pen to take notes).
My suggestion? Buy a tri-fold case with multiple viewing angles (both Infinlad and Poetic have options with a pen holder) and buy a separate keyboard (I found a nice, foldable one WITH a trackpad, which these cases lack).