I have used Leupolds almost 40 years. I think they they are good scopes and the service from the company is excellent. As I got more into the long range, precision shooting, I have had some that have had problems and were sent in for service. Fortunately, non of the problems accurred when I was hunting. The Mark 4's track well but I have had a couple of problems with two of the four. One would not hold the parallax setting under recoil, the other lost some of the turret clicks. Not major, but annoying. I have also had issues with a couple of my target turret models with tracking. All were fixed but a while back I decided to try some different brands. While I still like and use Leupold on several of my rifles, I now a couple of scopes on my target rigs, and put two Huskemaws on my LR hunting rigs. Don't know about the long term reliability of the Huskemaw, but they have great glass, track perfectly, and have some nice features. I really like this scope! They are pricey, but I paid for them by selling off a bunch of rifles and scopes I accumulated over the years and never used.