Swamphunter and Kimber7man. I have both brands but not in the magnification range you looking at. I have punished both brands. So far to date, 1 of my 2 Redfields have went back, none of any of my Vortex products have went back. Most of the Vortex products I have had over 2-3 years.
With that said, I must agree the Redfields are a ton of scope for the $$$$
Much is pending on what you want. Optically the Diamondback is a bit ahead of the Redfield in contrast and clarity. Eye relief goes to the Redfield but the DB is very useable. Ergonomics go to the Redfield as the DB has a larger ocular.
YMMV... Dollar for dollar, I prefer the DB even though it's a bit more costly.
