At the predecessor I had (positive) expressed myself already. When evaluating I will stay at the new keyboard case by Logitech. The new FabricSkin fits perfectly on to the iPad Air, since it is about 160 grams lighter than its predecessor. The price of such material (complete protection) has been saved, do not bother me. I hold the iPad Air protected sufficient. It can be removed much easier from the holder and sits still firmly. For safety's sake I have still raised a self-adhesive film for the back and will still grow me a fitting display protection. For those interested, iPad2 3G & FabricSkin: approximately 1210 grams. iPad Air Cellular & FabricSkin about 910 grams.
Addendum: After about three months of my keyboard had unfortunately also the problem that the holder in the amount of I / Ausschaltknopfes has erupted. Apparently a real design flaw. Since the iPad Air then no longer holds in the sheath, the sheath is no longer usable. Went back to the dealer. The money was refunded. Am now switched to Belkin (30 grams heavier). Too bad.