It's fine for the price, quite thick and heavy but I wanted something that would give decent protection and it does. The Apple cover looks funky but doesn't do a lot to protect it when it's in a bag or something.
I did look at the back covers that you've linked to and I've heard pretty good things about them. My issue was my enthusiastic, iPad loving 3 year old and the cost! But, the one I have is so cheap that I wouldn't mind upgrading to a better one when I see it. I needed something in a hurry and it served the purpose.
I have a smart cover (got a seconds one for 5 because it's got a small bubble in it) doesn't, bother me. Then I got a back protetor from eBay for a £1 and a sticky cover for the screen which was 50p from eBay. You cant see the screen cover at all, and the back cover clear plastic still fits the smart cover I find it all works really well. The smart covers arnt worth the £35+ apple are charging though, you really can't see the bubble in mine unless you go looking for it