I have several of the 'original' optisan viper 3-12x and really like those scopes. Actually have a couple in storage that I've replaced with scopes that have a higher max mag for the shooting I do.
I tried 2 of the newer offerings and returned them both. Nothing repeatable about the clicks or sidewheel markings (again... for my style). Others have said good things but wasn't the case in my world. Still think the good history holds hope for the future.
Hope you get a scope back!