This is just a quick review since I don't feel like redoing the 15,000 iPhone 4 reviews on the web. I had the original iPhone (now that the phone in it is turned off, it's basically an iPod Touch) and this phone works the same way. Whee. It does have some advantages: the screen is amazingly stunning, it's a little bit thinner, it runs significantly faster, and there's a huge difference between the old EDGE network I was using and 3G.
The cameras aren't anything ground breaking (keep in mind my "it's not a real camera if it has a ringtone" thought) but they work well enough and the FaceTime feature where you can do video chats is going to be amazing once more people have devices that it works with (I'm guessing the next generation iPad will definitely have cameras and I see no reason why it wouldn't be possible to use iChat... Apple just has to want to turn on the functionality.)
The big controversial issue is the antenna, of course. I have to say that I didn't see any issues with it at all using the phone bare. It made calls, got my email, did what it was supposed to without drama.
I did end up buying one of the bumper cases though, about two hours before Steve Jobs announced that they'd be giving one free (or giving a refund on a previous purchase) to everyone who got an iPhone. Apple did right by me here. I was figuring that I'd have to fill out some sort of online form and they'd mail a check to me in 4-6 weeks. However, I just got an email saying "Hey, we noticed you bought a bumper a couple of days ago and we just wanted to let you know that we've refunded your money from that purchase back to your credit card." It's definitely nice when companies are being pro-active. (Remembering back three years, I think they did something similar with the orignal iPhone when they dropped the price from the $699 that I paid to "only" $499 (or $599 to $399, whatever it was)).
So, my only peeve with the phone is actually part of what makes the design cool. Both the front screen and the back panel are smooth glass... which means that you can't easily tell which side it which when it's in your pocket and I end up pulling it out backwards a lot.
I have an amazing plan though, watch for a post about it this weekend!