I bought this case when I first bought my iPhone 4 in August 2011. This case has lasted over a year and a half of constant daily usage, happy to say there are no scratches on my phone screen!
All of my relatives and friends have smashed their iPhone screen at least ONCE within 6 months of buying their phone. I have had my phone now for a year and 7 months and have never had to get my phone replaced or repaired!
I am ordering another one of these, as although the case is fantastic for protecting my phone, unfortunately the case itself was showing a few signs of wear and tear, and was beginning to look old. Fortunately with a price this low, I am more than happy to buy another to replace it!