Firstly, I've been through those 7 quid dodgy cases, which last 6 months and break apart when you apply a bit of force to them. This one is Quality!
I have been known to be careless and since having my Galaxy S with the Tough Case on, it seemed to have passed with flying colours. I have dropped it a few times. My younger son threw it at the fireplace and the phone is still working fine.
The good thing is that the inner case aborbs the impact and the outer case is ABS, so can withstand certain shocks, falls etc.
I take the phone with me while mountain biking and it is dropped out of my pocket a few times and a lesser case would have broke, but this only has scratches and marks, the phone is still tip top shape.
Reccommend this case to all. My Son threw this at my brick firepace and my phone is still standing. Awesome!