Noticed how you said IMacs & MacBooks compared to a cell phone? Even though they got rid of the "Plastic" when it comes to laptops we are much careful and rarely drop them so the plastic doesn't matter. & sure the iPhones were once polycarbonate but its time that we evolve..which leads us to our aluminum n glass unibody design..& With such a "great" phone being the sIII u would expect to be more durable around household items not break when u accidently drop it form 3ft. But time after time the iPhone has proven to be much stronger than the s3