I've used primarily Leupolds my whole life with a NightForce, Nikon here and there. Four years or so ago I decided to try Vortex scopes because the price was attractive and I felt it was worth a try due to the price point most Leupold LR's & MK 4's were at. The three Vortex scopes I tried along with my brothers were less than pleasing to say the least. These weren't zero and forget setups, these were on long range rifles where the turrets had to be repeatable, which they weren't. All off them had a issue with tracking in the elevation adjustment on the turret.
This wasn't a problem with the rifles, they were solid performers with a Leupold MK4 in place. With the Vortex scopes, the first round was always out after a elevation turret adjustment. As in going from a 300 yard zero to my 600 yard dope. The first round would be out and the second would settle in. I called Vortex and explained it, they don't want to hear it. I sent one scope back once and a second twice. They said they looked them over and they were within their specs. What good is the first round being out when it comes to a long shot in a hunting situation.
Sold them cheap mounted my MK4 back up and the issue was solved. Now as for the new HD stuff I can't speak for I have never used it. I just learned, don't fix it if it isn't broke.