I did a lot of research before buying the Kenton turrets.........reviews are good to great. I got the speed hunter out to 650yds.....could have gone way more, but then they stack numbers for a second revolution which means smaller numbers that require me to wear reading glasses, so it was big numbers and single revolution for me.
Mine are on a 2 1/2 - 16 X 50 Bushnell 6500 Elite on a 7mm mag. I will be taking it out to 500+ here soon, only shot out to 385 so far and it was dc.
I think with these you get what you pay for, and they required ALL data for the ballistic apps. I will add that in the future, I will just run data through ballistic app and make my own cheat sheet and dial moa. That is also easy as can be.