I have one and like it enough to be getting another.
My other scopes are an old Nikon 3-9X50, a Leupold Mark 4 4.5-14X50 ill TMR, and a Zeiss Victory 6-24X56. The Victory is clearly the better scope in the bunch. But among the other scopes, the Vortex has the better image and it is very solid. Features wise I like the illuminated FFP reticle and it is well laid out. The scope has lived up to my expectations and I have shot it on three of my rifles over the past 4 months. It seems to have good mechanics and it is hard to find the same features with good glass at a similar price.
Don't get me wrong. This is not like my Victory. But it is as good as my Leupold Mark 4 at a lesser price.
The Viper has a nice clean reticle that is well laid out for me. I have the MOA-MOA version and it is very easy for me to use.
As I noted, I have one and now I have another on the way. That should say I am pleased with the scope.