I purchased the 32GB model of the Verizon LTE iPad, and while it is a great box (see my review on Amazon), it does have its problems, the most glaring of which is that it takes 6 hours to charge from 0% to 100%.
Obviously, if Apple doubled the capacity of the battery while keeping the USB charging constant at 2.1A/5V, then something had to give and that thing was charging time. Oh, how I miss Firewire.