We opted for the Verizon mifi and have been pleased with it so far. It's 4g where available and 3g when not. My wife is pursuing a masters degree and most of her classes are online so we need reliable connectivity and other than a few times when we've camped in places with very poor cell coverage the mifi has worked out fine.
I created a website that we update weekly that enables our family and friends to follow us on our RV adventure so I too need internet connectivity. Like Janet, we look for campgrounds with free wireless internet but the speed of their wifi can be painfully slow. I prefer to use the free wireless when I upload pictures for the website and save the bandwidth of our mifi for my wife.
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