I will give you my most honest opinion. At least in my environment where I fly without obstruction, the battery is the limit. I passed 24K FT distance and I had to come back because the battery. I was able to archive this with the DUO II and the Raptor XR No boosted. This was done with the
Mavic Air 2. With the
Mavic 2 Pro I got 18K FT because the battery last less since my batteries has each probably over 50 cycles. When i did the test with the
Mavic Air 2 the battery was brand new.
Now having obstruction and I am talking tall trees and hills obstructing the difference is was not significant, just about 800 FT more than stock antenna. I was expecting little bit more from the 2.4Ghz but the hills where killing me. I know if you fly higher you can get much more but is against the low so I wont go there.
The real good benefit is how fluid is the image. There is not delay or lag or freezing image. That is really impressive.
The allientech are build with nice quality and the boards looks very well done like apple style. Their support is class A as well. They answer your question in English very quickly if you go to their Facebook page over the messenger. If you email them, they take about 1 to 3 days on answer. I recommend go to Facebook. I am not sponsored or anything like that but i really like their products. I have 5 antennas from them currently.
For the distance testing I was having 3 visual spotters on the ground.
Now the last questing. Do they worth it? I will say if you can afford it YES. I think there are nothing better in the market rights now with the performance in a compact package like their boosters.
Now If you want something cheaper but bulky and you don't care about the bulky part, go with the Raptor XR antennas no boosted. I can not imagine how good can be the Raptor XR boosted. They most to be awesome but will make it super bulk.