Ive got a Viper 6.5 -20 on my T3 Varmint and can't tell the diff from my previous Leupold Mark 4. Great scope, the best warranty in the biz and prices that are affordable.
I also own a pair of their cheaper Vulture series binos, I was pleasantly surprised when they arrived and I used them last fall for whitetail hunting. Solid build, clear glass. .
Only fault I can see in Vortex is the silly names they put behind their product...which has no effect on anything.
Cheers!!