If what you're looking for is protection, I can vouch for the M-edge covers. I was carrying mine in my purse one day when I fell headlong in the parking lot, falling on top of my reader - and I'm a big person, so it took quite a whack, as did my knees. My reader only took very minor damage - a small nick in the corner that you wouldn't notice unless I pointed it out to you, and the power button being knocked loose which was easily fixed.
It took my knees weeks to recover, but my Sony was right as rain.
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