For these reflectors to work, the distance between the antenna and the reflection surface is critical because the reflected wave must be in phase with that radiated from the antenna so that the radio energy is reinforced instead of cancelled. My Mini only runs on 5.8 GHz and it works very well. May be those who claim that it doesn't work can check which frequency band their Mini are working on ?
That’s a good point. I barely use 5.8 because the max distance I can achieve is 500 meters and I can see minimum/no benefit on 2.4 where I get at least 1300 meters by default.