I have always bought a Wi-Fi model simply because my iPad rarely leaves home and I have a very fast Wi-Fi connection both at home and at the office. However since most stores are giving a $100 discount, rather than pocket the $100, it might be worth using the discount to get the cellular model. T-Mobile currently has a promo for iPad Air 2 customers that gives you 5GB of data for 150 days at $10. Most carriers charge around $10 per GB, so 5GB at $10 means you get $40 for free. T-Mobile also gives you a free 200MB per month which is 2.4GB a year. That is worth roughly $24. So in two years, you get $48 plus the $40 from the promo for a total of $88. Most people spend $130 to get the LTE version just to be able to get cellular service. Now you get $100 off and $88 worth of data along with the benefit of free GPS and being able to connect to the Internet whenever you need it.