Engadget tells us 500,000 iPhone sold in 3 days.
That IS a pretty good start for a new product. Other sites tell us less than 3% had problems with authentication issues.
A good recap of what a handful of knowledgeable New Users thought can be heard on Leo Laporte's TWiT Podcast of July 1, 2007.
My conclusions from various readings tells me the following:
1. Not anything really new is used in the hardware side of this wonder. But the implementation is what makes Apple APPLE.
2. The Cell Phone Bar has been reset by the iPhone, telling us that not very many people have been happy with the same-old same-old.
3. It's not just the technology, but how you FEEL about a product that can change everything.