This one, however, convinced me. Visually it is the "original" modeled very identical. The buttons and analog sticks are smooth and the Vibration works perfectly. The device has - as indicated - no delay when you press the buttons. The range I find very good, I sit playing at some distance more than 2 meters away from the TV, and the controller works perfectly.
The only drawback: the controller is very fast in the standby mode. After a few minutes break, and he switched to economy mode and sometimes makes the resynchronization some problems. But you just have to have a short wait.
All in all: buy recommendation at the low price!