The HDX is the strongest evolution of the Kindle Fire brand yet; however, you'll want make sure you're a card-carrying citizen of the Amazon Prime ecoverse to get the most out of the tablet's offerings.
Last year's Kindle Fire tablets were bulky, substantial, and seemed to prioritize durability over comfort. The Fire HDX 8.9 is much more thoughtfully designed. It weighs just 0.82 pounds, which is incredibly light for something I consider a large tablet. It feels well-balanced and is easy to hold in one hand. It's light without feeling too airy.
Both the power button and volume rocker have been moved to the back, and while they're easier to find and press compared with the old Fire HD 8.9, I'm not sure it's the best solution. It's fine when held in landscape mode -- the rear edges can be used as a tactile guide -- but it's annoying when I want to quickly wake it from sleep, but have to pick it up first to reach the back instead of just tapping a button on its side.