My only experience is with the cheaper line of Fullfields. I bought one last year- a 3-9x40 and planned to put it on my 30-06 but tried it out on my .340wby. Probably too much rifle but I did it anyways. On the eighth shot it went to pot. It wouldn't track and wouldn't hold zero. I will never buy another one.
Now my friends who own Signature and black diamonds love them and never complain. I would buy one of those.