There are little slits that you can use a plastic pry tool to pop off the case with. Avoid using anything metal or too hard so you don't damage your aluminium casing. The slits on the top half of the case should be about an inch down from where the tabs are on the case from the top, on the sides of the screen. As for the bottom half i used a plastic spatula and pried around gently until the case popped from one corner then the rest came with it.
Yes! I ordered it in red after ordering the wrong case initially. I am very happy with it. Look at the description of the case to make sure it matches the description of your Mac. It is expensive to send it back once opened.
Umm there's no cut out for the apple logo, so it is basically like you said a "slab" across the top. However you can still see the apple logo through the case, but it's a little blurry due to the rubberized material i think. you'll see it better when you turn it on and the logo glows :) hope that helps!