I have 2 in 2-7X, 2 in 3-9X, and one Droptine 3-9X, and they are all keepers.
Also have one Nikon 2.5-10X with BDC.
Prefer the Droptine over the Fullfields because the turrets are much better.
Prefer the Burris BDC lines over the Nikon BDC circles.
Once the Fullfields are zeroed, I don't touch them, and they hold zero just fine.
They are on calibers from 308 to 22LR.
Only ones that get heavy use are the Droptine 3-9X 50mm on 22-250 bolt and Fullfield 3-9X 50mm on my 6x6.8 calling AR.