I needed a secure and comfortable case to protect my iPhone 5S. This fulfilled my requirements - it offers all-round protection including a lip on the front, it is grippy as I am prone to dropping stuff and it doesn't slide so easily out of a pocket and lastly it isn't too bulky.
I wish it came in less garish colours than pink and blue (for girls or boys - how very last century!) and it's maybe just a millimetre or so thicker than it could be. But it's fine and (so far) it does what it says on the tin having survived at least half a dozen minor drops.
Shave a millimetre all round and offer a bigger range of colours and this would be unbeatable!