I have experience with both. The Razor is better in all aspects, but you ask the right question. Is it $800 better, I don’t think so. I can’t tell a difference in the glass. My understanding is the Razor is built to be tougher. The Viper has held up well for the range. I appreciate the savings with the Viper.
I have both, and it’s definitely a noticeable difference. More forgiving eyebox, clearer glass, better/more crisp red dot illumination. I find it more enjoyable to shoot for 3gun and you’re running and gunning, but if you’re just sitting behind the gun in the prone, you probably wouldn’t need the Razor.
Last weekend coming home from the Wisconsin Dells I stopped at Vortex headquarters. Nice showroom with all their products on display to look at. There's at least a 1000 yds of open prairie to scan with their optics.
I picked up the 1-6 strikeagle first, thought, ok not bad. Then the 1-8 strikeagle and thought the eye relief was a little more strict.
Then I picked up the viper 1-6, wow surprised. I felt like I was inside the scope. The eyebox was huge, I felt like I could see all around and field of view seemed huge.
Then the razor 1-6. I expected this to be even better but was underwhelmed. I could tell the glass was better but it felt like I was looking through a tube. It didn't feel like the field of view was as big, although the specs say it is bigger.
I went back and forth between the viper and razor and decided the viper was better for me.