I am not based in the US - but rather I live in Australia. Here the Iphone 3GS is massively popular. I have resisted the Iphone craze because of what it is... A Craze. Iphone users seem to think that as soon as the Apple logo goes on a product it is flawless. For example Macs don't crash, freeze or get viruses - What the?!
I recognise that Apple generally release well put together and MARKETED products, but no matter how much hype they give their products they will never be flawless and there have been issues with call quality and signal coverage on iphones for awhile - not just in the US but here in Australia.
I hope Apple gets a wakeup call over the early release of the Iphone 4 - but then why would they when people will just blindly buy products that they stamp with their logo?