I have the Vortex Diamondback Tactical 6-24x50 with FFP EBR-2C MOA reticle.
I usually buy higher end scopes, but this was for precision .22LR, so I figured if glass was decent out to 300, that would be "good enough" for a .22LR precision bolt gun shooting subsonic match ammo at relatively moderate distances. I was attracted to it because it's side-focus parallax went down to 10 yard and the FFP EBR-2C reticle, which is a good design for my intended use.
Out of the box it shot great out to 200 and resolution was still decent at 300 but starting to lose a bit. Tracking is good.
But, after a few outings, the side focus started feeling difficult to move, and then it would no longer focus or adjust at all beyond about 25 yards. It simply was no longer suitable. Something failed in the side-focus.
I boxed it up, filled out the paperwork, and returned it to Vortex. They replaced the scope. Turn around time was about three weeks or so. The turn around was reasonable.
So far, it is now performing as it should. Fingers crossed. I'm happy with it for now, but have lingering doubts about manufacturing quality.
I own a lot of scopes from many different companies from Zeiss Victory and Kahles down through several tiers of Leupold, Burris, Weaver, Nikon and others, accumulated over several decades. This was my first Vortex and my first ever return of any scope for a manufacturing defect. I have had 20-30 year old scopes need service on a couple occasions over the years. One when a horse stumbled and threw me and scoped rifle (busted eyepiece) another when an internal seal dried up in a 25 year old scope, but never a manufacturing defect, and certainly not in a new scope only a few weeks old.
Vortex is known for excellent customer service, and they met that reputation. I'd rather own a scope that never had to go back than one that has to go back soon after purchase, no matter how good the customer service.