I can text at a normal speed, nowhere near as fast as I can type though. Although I do kinda cheat in the fact that I tend to misspell an odd word here or there and my iphone automatically corrects it.
I also text quite frequently, but I'm always doing something else(whether it be watching tv, playing on my phone, or other stuff). The one thing I do like about my phone is the fact that it does remind me 5 minutes later that I have received a text, if I'm too busy doing something else to check when I first get the text.
Although reading the article, I don't know if this really counts as breaking the world record, as the phone is doing most of the work for you. Kinda like using T9.
Edit: 1000th Post