I'm the opposite. I've had two iPad with Wifi only. This time I decided to get 4G to have a ubiquitous connection, plus, I plan on keeping this one for two years.+1
3G>3G>and now a Wifi
I have only used the 3G on my iPad once and that was the first month of the original iPad launch. I have absolutely no need for it. But the 4G almost hooked me.