I've tried a few cases. I began with the Amazon Paperwhite case which was fine except that I want to be able to remove it easily so I can use the Paperwhite without it at home and with it when I leave the house.
I bought a couple of Ebay cases. One was so difficult to remove that I needed a screwdriver. I won't use that one again.
One was fine except that it has a little snap flap that wasn't easy to get out of the way when I was reading and I was always afraid of it scratching the screen.
I ordered this one:
http://www.ebay.com/itm/190803415865
and it arrived yesterday and it's pretty nearly perfect. It's easy to put on and off. It's pretty light; lighter than the Amazon case by far. It's also a lot more comfortable to hold. And, best of all, the magnet that turns on the screen also holds the door closed real well when it's off. This is the one I'll be using.
It says it's synthetic leather but it both looks and smells like real leather. I'm sure that odor must be artificial and who knows how long it will last but in the meantime it does seem real. It's slight enough that I don't really notice it unless I happen to be thinking about it.
Barry