I am interested to hear from those who have done this. What did you pay (aprox)? Where did you find the seller? How much data do you actually use to justify the purchase? What kind of speeds and reliability are you getting from AT&T in your area? I am in the market for an iPad unlimited plan personally but I have been having a hard time finding them for sale for a reasonable price. Sorry eBay guys selling for $550 but that just isn't going to happen.