I did pick up an iPad Air 2 last week, and the jump from the iPad 3 is a big one. The performance jump combined with the tablet form factor has me using the iPad more over the laptop at night, even for gaming. Hearthstone loads quicker because the iPad lacks the Battle.net launcher overhead, and the app is kept up to date automatically. And the increased RAM allows me to swap in and out of the game without it being forced to close.
The Apple SIM is a really nice change as well. Right now it's sitting on T-Mobile for their 200MB free plan, though at any time I can transition it to Sprint. Unfortunately AT&T is locking down the Apple SIM if it's ever used on their network, requiring a replacement SIM to be bought from Apple to be able to switch networks.