Steam Controller

It is important to note that this controller was not designed primarily as a general gaming gamepad. It was designed to function as an all-in-one input device for a Steambox attached to a living-room TV. Thus, it must replace a mouse and it must replace a keyboard (the 'gaming keys' of the keyboard mainly). Most reviewers have noted that as a gamepad, it takes some getting used to. But many note the same for using it as a mouse and using it as a keyboard replacement (for games). However, many have noted that it works well mouselook while using a gamepad which is something a personal computer does not do as well.

Buttons:
1 There is the Steam button, which I am unsure if it can be programmed as a general button
2 The < and > buttons (start/select, play/back). Traditional buttons.
4 The A, B, X, Y buttons. Traditional buttons.
2 L and R Buttons (not sure of the designations). Shoulder buttons.
2 L and R Analog Paddles (not sure of the designations). Shoulder buttons.
2 L and R Triggers (not sure of the designations). Under the grips.
1 analog down-click button.
Now at 13 or 14 buttons, 9 suitable for quick actions (ie: < and > are 'menu use' buttons really), people have complained about a lack of buttons. 13-14 is on the low-end of gamepads these days with the latest consoles having 14 or more buttons and many personal computer gamepads having a minimum of 14 (if you count the D-pad). But, the trackpads are configurable, easily adding 2, 4, or even 8 or 9 front action buttons on the right pad and 8 or 9 more 'menu use' type buttons on the left. Since the pads use haptic feedback, one can slide or rest their thumb on the pad to 'feel' the 2-9 additional buttons they defined in the config, then press down to feel the 'click' of these buttons. So, 13-29 buttons (you can type with it if that's really what you want to do).

Well, actually, everything is redefinable, not just the trackpads. Again, this an all-in-one keyboard/mouse/gamepad replacement.