Over the last year or so, and probably upward of 15 different Vortex products, including spotting scopes (2) binoculars (2) and I honestly don't know how many rifle scopes, but a little bit of everything. At this point in time I am having to re-evaluate Vortex QC. I just boxed up the third rifle scope yesterday in about 6 months for return. I like what they offer for the money, but I'm just not sure that quality control is as consistent as with Leupold, and other time tested optics.
In more than 3 decades of the above variety of Leupold optics, I have had only 2 problems that weren't my fault, a pair of glasses from about 1980 that started leaking, and their top of the line RX-IV RF. Of course Leupold took care of me on both issues at no charge.
GS