I have the Burris fullfield II in 4.5 x 14 and have been very pleased with it. Your looking at the same model that I am seriously considering. Their warranty is very good as well. The PD has two of the 4.5 x 14's and one went down. They replaced it for free and had it back to us in under 30 days.
It sucks to have to use a warranty but at least they stand behind the products.
It sucks to have to use a warranty but at least they stand behind the products.