I only purchase Otterbox. I have it for an iPad, Kindle Fire HD and Kindle Fire HDX, and all of these devices are still in great shape due to the protection offered by the Otterbox. Especially, the Kindle Fire HD, which is owned by my youngest and I can tell has taken a beating, not by careless handling but unintentional dropping, not surprising from a kid.
The Otterbox I purchased for my brand new Kindle HDX is great, it fits like a glove. My only critic is that it adds a bit of weight, I do get tired after holding the Kindle for a while, but considering the fact of how it's protected, this issue is minor. I dropped my Kindle for the first time after I enclosed it in the Otterbox, face flat, but I was not worried, I feel that confident with the case. I don't worry about protection, not anymore since I have the case on my HDX.
Pros: High quality, Durable, secure protection
Cons: not waterproof, adds a bit weight not much but noticeable