I too got this in HMV for a tenner, and I'm so glad I bought it.
Although it is thin, it is extremely durable, and like the other reviewer said, I don't think anything could cut it, except maybe an electric saw ;) buttons are just as accessible, as easy to press without the case on. The back is nice and grippy, it's not made from that cheap horrible soft type silicone which rips so easily.
One thing worth mentioning is that you can charge it with the case on, but it may not fit in some iPad docks, plus I use the official apple cable which came with my iPad, and that fits in fine. If you have a third party cable with a slightly chunkier connector, it may not fit.
If you like the look of this case, pop down to your local HMV and see if you can get a bargain. If not, just get it on amazon :)