This case protects the iphone from bumps and scratches, and its silicone gel finish means its easy to handle and non-slip. It also looks really funky, just like a cassette!
However I do have quite a few gripes with it. Parts of the back of the phone are still exposed, and these have become scratched whilst the phone knocks around in my bag.
The case itself has to be removed everytime you charge the phone - which is a massive oversight on the designer's part as it causes the silicone to stretch, making it become a baggy fit to the phone over time (I've only had this a month and it's already happened). The other disadvantage to this is that as the case becomes looser it is harder to press the phone's buttons (volume etc) through the silicone cover.
And of course I quite often forget to put the case on when hurrying to work, unplugging my charger etc.
A great looking case, flawed design, and I'm ordering a more practical case for everyday use.