I installed a Burris Fastfire 2 on my W.R. 450/400 3". I was told that the Doctor Optik was the best however I did not want to spend so much money on a sight (3x the price of a Burris here in S.A.)until I was sure that it worked for me. So I bought the Burris, thinking I will replace it at a later date. It has been 2 years now and I could not have asked for better performance- a couple of buffalo can attest to that!
Regards,
Charls