Xbox
Released in 2001, the Xbox control pad was the first controller made for the original Xbox. The Xbox controller features two analog sticks, a pressure-sensitive directional pad, two analog triggers, a Back button, a Start button, two accessory slots and six 8-bit analog action buttons (A/Green, B/Red, X/Blue, Y/Yellow, and Black and White buttons). The standard Xbox controller (originally nicknamed the "Fatty" and later the "Duke") was originally the controller bundled with Xbox systems for all territories except Japan.
Xbox 360 controller
The Xbox 360 controller received positive reviews when it was released. Before then, as IGN stated, the original Xbox controller was "huge, ugly, cheap, and uncomfortable" and concluded to be an "abomination". Many of these problems were corrected with Microsoft's releases of the Xbox controller S and then the Xbox 360 controller. IGN credited the Xbox 360 controller for its being one of "the most ergonomically comfortable console controllers around". It was also praised for its improved button placement, its functioning logo as a button, and Microsoft's choice of bottom-mounting headset ports as opposed to top-mounting them so as to minimize snagged wire problems.