My wife and I both switched right after Jobs announced the iPhone. I downloaded the keynote as soon as it was available, went home and watched it. My wife was even in awe as Jobs demonstrated it.A lot of them are really hating because they are locked into a competitive contract of they can't get At&t service where they need it. T-Mobile and Verizon users are really POed because they feel like they didn't get asked to the prom.
We had Verizon and luckily we both got out of our NEW 2 year contracts with the text message increase they had. I've never felt luckier. We had Verizon for just a few months and switched because the network was supposedly so much better... which I didn't find to be true anyway.
It all worked out though, because we switched to Cingular and I WILL BE getting an iPhone on launch day if I have to camp out that entire WEEK!