Zeiss makes quality stuff, no argument, but 50mm objectives just plain suck.
They were all the rage for a while there, and yeah, they look real cool, but the negatives outweigh any perceived positives. They're bulky,heavy, require high rings, which can mess with your cheek weld.
And, while I can't state this as a fact in this case, I'm thinking Zeiss is one of those companies where a good bit of what you're paying for is the name. In the $300 range, I'm thinking there might be other options that'll give you more scope for your money.
Also, there's no parallax adjustment on this unit. I'm assuming if you're looking at 12x scopes with jumbo objectives, you're probably looking at shooting some distance. if so, something with parallax adjustment will be more ideal.
That's my .02, worth what you paid for it !
BTW, this was from one of the reviews in that Amazon link: "Nice scope if I had to do it over again though I would've bought a Leopold".
There have been several recent threads on scopes, with lots of solid recommendations, as well as where to find the current deals. Try and hunt them down.