I wish I hadn't run across this thread, and at the same time, I am.
I am trying to decide on the Air or Air 2. I like all the little improvements of the Air 2, especially the fingerprint ID and faster processing, but not at the expense of a problem like the screen finger ghosting or this popping thing. As people have said, did Apple go to far in making it thinner? What kind of compromises did they make internally over the original Air? Has anyone done a teardown to see (I forgot to look until just this minute, and I have to run off to work) ?
That said, I spent about 20 minutes at Best Buy yesterday playing with both the Air and Air 2. In that time, the Air 2 demo model didn't pop or buzz once. I didn't have time to do a lot of tests, but did play a few music tracks and opened a few apps. I did notice the sound was thinner than the original air, but a little clearer. What I didn't like was the way music made the back of the case buzz, especially right of center at the bottom (next to the speaker). It felt like a totally hollow spot that was acting like a resonance chamber. The screen also buzzed, and overall, made the device seem cheapo (but again NO pops). The original Air did NOT do this.
Did Best Buy have the very latest manufactured version of the Air 2 out on display, that maybe had the problem discretely fixed in later production runs? Were they lucky? Who knows - the screen ghosting caused by finger tips on the back were very minimal as well.
It almost gives me a little hope. Best Buy (and Apple) obviously doesn't want to put a demo out that people are immediately going to find defects with. Maybe Apple has taken all the feedback in (or feedback from BB employees that told them it's hard to sell these iPads if they all the demos pop) and quietly found a fix? Maybe I'm being too generous ;-). Maybe BB has been through a bunch and finally found one that is silent. But, that makes me feel it IS possible, and fixable if people are persistent with Apple over it. It's a shame Apple couldn't just have left the case on the Air alone and just added the improvements without adding problems ;-). Too much form over function at Apple.