I have had the phone. I went over to the iPhone 3G S. Well, its a great texting phone, however the web is annoying as hell to get on. The phone offers no Wi-Fi connectivity, and rarely gets 3G service.
The phone physically is rather thick in size, and it will flip up, which also switches the screen to that position. The keys are actually very small, so you'll have to get use to it. As for the battery, its drained rather quickly and you'll need to charge a lot.
The audio quality is also pretty bad, sounds all sketchy and staticy. So, think twice.