The difference in thickness is immediately noticeable, and the Air 2 can easily be flexed a bit. I didn't push it too hard, but the Air is definitely more stiff. While the difference in weight is small on paper, I can feel that the Air 2 is lighter. The flexing is something that I'll have to think about for a few minutes, but I'm stopping to flex it as I type this. I'll go to Best Buy and flex their display model to its limit. I'm not declaring flexgate, just an observation. When I had a Samsung tablet couple years ago, it flexed easily. The Air 2 seems to have a very slight curve, and that was what prompted me to flex it in the first place. EDIT: Okay... Using daylight, a dead flat surface, and a drafting straight edge, I looked at my Air 2 and Air 1 again this morning. The Air 1 has a much greater curve along its length than the Air 2. Both tablets have a concave bend toward the screen. In my living room last night, the Air 1 did not seem to flex, but it quite clearly flexes to just about the same degree as my Air 2. I've used my Air 1 without a case since last December, and I'll assume it's always been like this; I've never sat on it. I thought I'd have to put the Air 2 in a case, but it's more flat than the Air 1, so I'll just use a Smart Cover for now. What a relief. I woke up this morning, thinking I'd have to debate returning the Air 2 this weekend. The bend in the Air 1 has quieted the voices in my head.