Aside from being a magnet for grease (I find all screen protectors are though), it's fine. I put it on at the tail end of Feb and it's still holding up fine. I don't see the need to change it for a while
You don't need the keyboard for the case, but it is an all in one if you see what I mean? You fold the keyboard bit back so it lays flat on a desk when you're not using it. It's a good case, but there are probably better if you just have the tab. I'll see if I can find a link for the case I had pre-keyboard if you like?