Actually very good controller.

edit: after playing Witcher 3 and some web browsing using this controller for 60+ hr.

It was very good, you will forget your 360 controller after using this for some time, it can replace standard joystick and still have more advantage to it, battery still have some juice in it even after my 60+ hr use.
Bumper button a bit too hard and clicky though, but trigger button was soft and comfortable to touch, bumper also have 2 stage trigger which can be useful in certain condition, the other button were standard and not too mushy.
The two touchpad have some texture in it which is good, unlike some standard touchpad laptop, you can glide your thumb effortlessly and comfortably.
Despite the controller weird look, it make your thumb sit comfortably to the touchpad. the downside is you will need some time to adjust your hand to reach the xyab button.

Very customizable, can do almost anything, downside is you must have steam running.Can be used to browse the web, text a message while laying on your bed without the need of your keyboard and mouse. well typing can be a bit slow though with steam on-screen keyboard.