Hi, What would you consider the most difficult thing on the Amiga from a personal perspective?
Longevity wise, I would point out the mouse and keyboard. Roller ball mice are notorious regardless of who made them. I prefer optical trackballs, anyway.
I love the Amiga's keyboard, the deeper finger wells to mark the F and J keys. It has all the keys I need and no extra fluff that has no function. I wish Commodore had made them as bullet proof as IBM made the original keyboard for the 5150. I have a few Keyra adapters, they work well enough I suppose.
I have no other complaints. Despite it's limitations with ever changing file and web standards (PDFs, Flash, CSS, etc) , Amiga OS is far and away my favorite OS.