Great case, great price, but bulky
The case is a great fit and actually makes for a more secure feel of the 'phone in your hands.
If you bought the Samsung for it's slimness, this is not the case for you. It also means that it takes up a lot of space in your pocket.
The Samsung Galaxy Sii and Otterbox are both brand leaders so it makes sense to go for this combination if you're not too bothered about your 'phone no longer looking so pretty.