I agree with Broz. Although they will not compare side by side with my Kowa, The Vortex spotters are great for the money spent. I mean I could have bought a Razor HD streight AND a angled for what I am in my Kowa. If I had it to do over again....I might have went with the duo instead. Now that the money has long been spent, no way would I give up my Kowa but I am considering a Vortex Razor HD angled spotter soon as I have discovered both have their times when they are needed over the other one.