I have currently in my possession, five Vortex products (not counting bases, rings etc.). In the past, I've had one other which was a Diamondback. I won't comment on the lesser Crossfire line as I've been disappointed in the Diamondback. A couple years back I spent some time with the Vortex rep buying a spotting scope and tripod: The Razors and Vipers clarity were not substantially different to justify the difference of $1000 although I was disappointed to find "Made in the PRC" when my spotting scope arrived... That would have influenced my choice. However, Diamondback glass was substantially inferior to the Vipers. The only riflescope I had fail was also a Diamondback... and it was on a 22lr: Maybe it was too much to ask the elevation turret to accomodate silhouette shooting out to 200yards? Anyway, the warranty is indeed excellent (they sent me a more expensive replacement in lieu of the discontinued model mine was) but lesson learned: I have no more Vortex optics that are bellow the Viper line and I have no problems.
The lesser lines exist of course to accommodate those with limited means or who are cheapskates. While the former don't deserve the trouble, they certainly have to bear in mind limitations they might encounter. The place on my 22lr, where that Diamondback once sat, is now filled with a second hand Bushnell 4200 that is clearer, endures 22lr 200y silhouette shooting and cost less. Instead of low range lines, second hand units of better quality would be my path if constantly strapped for cash... they can be tested for faults, and tube scratches are only price reducing cosmetic damage... Patience and perseverance to wait for something to come along, are two virtues that must first be cultivated.