iPhone is one of the most successful product that Apple has ever made. Not only did it capture the whole wide range of audience, it has a ripple effects on the sales of it's other products.
The wonderful interface and usability of iPhone introduces many people to Apple and it's range of products.
Prior to iPhone, I only have 3 iPods - the mini, nano and shuffle. Ever since the ownership of the iPhone, I have added a 20-inch iMac and the latest Macbook Air!
There's only ONE setback... the ever nagging of the woman in your life!