There really is a such thing as too thin. With the new iPad pro’s being 5.9mm, that is really thin for sure.As of yet, none of them. I am looking at the new iPad Air with 256 GB but I may wait a few weeks to see if any problems pop up. I'll admit I'm afraid of how thin these things have become, especially with the Pro models having problems being easily bent. I'd prefer something a couple of mills thicker with more battery space rather than trying to impress people that it is less than 7 mm thick. My friends, or me for that matter, don't care how thin it is after a certain point.
I currently have an iPad Air 2, but the battery life has dropped considerably. I use it quite a bit when I travel, as I am usually in small towns for work and little or no access to tv shows or movies in small no-name hotels so I always bring 5 or 6 movies and usually end up watching at least 2 or 3 per trip. I like the iPad Air size, and 256 GB I could preload a lot movies and shows. I could also afford to put my music on the iPad with that much memory, and it means my Bose Quiet Comfort headphones would still work. I can't use my older Bose with my iPhone anymore easily. I don't fault my current iPad for its rundown battery, I have used the heck out of it.There really is a such thing as too thin. With the new iPad pro’s being 5.9mm, that is really thin for sure.
As long as you don’t sit on one you’ll be okay. I have never seen a real bent iPad in person though. I’ve handled at least 10 iPad Pro 3rd gens, and I’ve owned 3. Never seen a bent one.
Getting back on topic, it seems that the iPad mini 5 is extremely popular! Especially with the specs it has.