Texting is a breeze on the iPhone and much easier than on a conventional phone.
After 7 months using my iPhone, I sold it on eBay the other day in preparation for the 3G model, and I've had to revert to my old SE K800i until the new iPhone arrives on the 11th of July.
When I tried to write a simple text yesterday it was excruciatingly slow, and the handset felt like something out of the Flintstones!