I previously owned the official Samsung flip case for my S3. It was alright, just didn't take long for it to get a bit battered. Hence why I have invested in the Snooper case.
The Snooper is outstanding value. I have only had it a day and I am already assured that my phone will be protected. All buttons can easily used and are not obstructed, which can be the case with other phone cases.
Also, the case doesn't really increase the size of the overall phone and it feels firm in the hand. The grilled back also insures that the phone will not slip out of the hand/off surfaces.
Overall I am very pleased with this product and for such a bargain of a price would highly recommend to S3 users.