Received this today! I was first surprised at the size of the cover, however it does actually fit quite nicely. It's not too loose, and will come off with easy enough pressure. The cover has a slot for the power button and doesn't cover it up. However the side volume buttons are covered, but there's a little indent on the side of the case so it actually doesn't make pressing them any more difficult than normal. Highly recommend this.
However there is one thing I will say about this, and that's the screen protector. Unlike the person above who managed to get it nice and bubble free, me? I threw mine right in the bin after trying 4x. First time I failed, so I re-applied without lifting it up too much. The second time I got everything PERFECT! Very pleased I pull the little tab to remove the outer protective film and the whole blooming thing came up!! Wasn't a happy sausage considering I then had hair stuck on it, and dust under it. Basically I got loads of bubbles after that and that makes it pointless.
In short the case = 5* and the screen protector I can't comment on. I'd highly recommend getting a pack of 6 for the cheap which you can get here on amazon for like £3-4. Saves the trouble and you've always got backup if you're new / rubbish to this like me :P