I have a Sightron S1 on my Omega that I bought used off of e-bay, it's clarity is pretty good.
The deciding factor in my buying it used was when I called Sightron to see what kind, if any warranty would be on the scope, they told me All of their scopes have a lifetime warranty regardless of how many people owned it before.
As long as the scope was not abused, it would be covered.
You can't beat that with a stick!

Give them a call