I am still owning an iPhone 2G and never used any case. My front is still completely scratch free, same goes for my iPad. I assume that the front glass of the iPhone 4 is the same or better quality than the old iPhone 2G or iPad so I won't buy any protection for it since its scratch-proof. But whats about the back? Does it have the same quality of glass as the front or is some cheap material that tends to be scratched easily?