I have that exact scope and love it. I wouldn't worry about any warranty...this scope is not one that will likely ever need it. About the only thing you don't want to do is try to lock down the turrets too hard. If you have one do not sell it, you will regret it...tracks perfect, holds zero and great glass, what else is there????
Sounds great but the last used one I saw had a $1000 price tag. I just can't afford the possibility of it becoming an expensive paper weight. Tangent Theta might work on one if it went bad but I would ask before I bought one used and even if they said yes,they may easily run out of parts and you would just be SOL.