We've worked with it in the past, but on the heels of T-Mobile's special event, Aaron goes in-depth with the T-Mobile variant of the popular Sony Xperia Z.  Available on July 17th for $99 down and 24 payments of $20, the Sony Xperia Z offers a 1.5 GHz quad-core Snapdragon S4 Pro CPU, 5-inch 1080p HD display, 13.1-megapixel camera with 1080p HD recording capabilities, 2 GB of RAM, 2,330 mAh battery, and Android 4.1 Jelly Bean with Sony's UI.  It's an awesome addition to T-Mobile's lineup, and brings Sony's flagship device to a US carrier.  Is it worth buying over offerings from HTC, Apple, and Samsung?