Wow... I registered here just because I'm seeing the need to add my .02...
The Conquest line of scopes are German parts
assembled in America. They're high-quality scopes. Much better than any Leupold or Nikon for the same price range, IMO.
As for Zeiss quality, German optics are some of the finest in the world, and only companies like Swarovski and Leica can produce products at this high of a level consistently. Nikon is catching up in the ball game, but don't do it consistently like the "big three".
Zeiss Diavari scopes are on par with Schmitt & Bender and Swarovski. You're not getting any bad glass at this price-point... it's ALL personal preference here.... which do you like the looks of, which name sounds better to you? That's going to be more difference psychologically to your shooting than the actual difference between this high-end glass.
Even the Conquest scopes use glass which is free of lead or arsenic, and also improves the optical quality. Nikon glass that is lead and arsenic free is trademarked Eco-Glass. Generally only binoculars that are $1000 and up have Eco-Glass.
Combine all of this with the Lifetime Transferrable Warranty, and you've got a damn good product, that until now, I've never heard anything bad about. Also, if you've ever heard about "coated" glass. Um... sorry to say this, but Zeiss was the first to offer optics with lens coatings in the world.
Schott Glass Works is owned by the Zeiss Foundation and IS considered to be the best glass in the world, bar-none. Do a search on "Zeiss FL" and hear what all the optics freaks are saying about their binoculars. Ever heard of Leica and Leitz? Their glass is manufactured for them by Schott. Enough said.
P.S. I work for a gun shop, and am not an employee of Zeiss.