I am right there with you!! I have been hunting for a truly durable leather case for weeks now and its honestly a nightmare finding something that actually holds up. Reliability is everything when you have such an expensive slab of glass!! Regarding what #3 said about "I recommend the Mujjo Full Leather Case for its protective 1mm raised bezel" - that bezel is definitely a plus but I am still so picky about how the leather wears down. I am in the exact same boat trying to find something that wont fall apart after two months!! Quick tips for the hunt:
Check out Mujjo's full leather case. Better value than Apple's at $45, similar quality, and adds a card slot. The tan color ages wonderfully.
Check these top selling leather cases on Amazon:
I recommend the Mujjo Full Leather Case for its protective 1mm raised bezel and unobstructed access to ports and speakers. Alternatively, the Andar Aspen made of premium full-grain leather offers durability and style (Mujjo, Andar).