I bought conquest (4.5x16x44) 4 months ago and sent it away to have target turrets installed. Just got it back and although I havn't been able to shoot over 100 yards yet with it, I gave it a couple turns and found I have just enough adjustment to poke out to 800 yards on my .308. If I put on a 20 moa rail then its no problem to shoot further. I wouldn't worry about the adjustment. As everyone else says, the glass quality is excellent and so is the customer service although you shouldn't need it.
In my opinion you should buy the conquest and not look back. With their transferable warranty you should save yourself a couple hundred and buy one off swfa.com
sample list. I bought mine ($600) a sample B and it was in NIB condition. I was hesitant to buy used glass I hadn't seen but after talking to swfa and zeiss I went ahead and couldn't have been happier I did.