I just weighed both 2 & 3 and there is a 2 ounce difference between them both, I thought I would just return the 3 and keep the 2 cause you can definitly feel the difference and the New Retina screen doesnt JUMP out.. compared to the 2.. but after using the 3 for a while and boxing the 2 up cant tell the difference too much now, got used to it.. but when you add the smart over to the 3 that adds another 5 ounces to the total weight if you leave it on.. so I would say the 3 wins.. but I suggest using it alone and getting a sleeve! When I used it with the smart cover, there was a big difference from the 2 to the 3 when using the smart cover and leaving it on when using it. So off to the mall I am to get the Armor for the back and a sleeve..