I have a SWFA SS 5 - 15 x 42 on my upgraded (Timmy trigger & Boyd's Classic laminated stock) Ruger Amer. Predator. Very good glass for the money, FFP, mil/mil, side parallax knob. BUT... the turrets, while stiff to turn, have NO locking mechanism, let alone zero stop. Other than that and a kinda stiff zoom ring I like it.
Got it on a rare SWFA sale for about $550. It's a good match for my very accurate but inexpensive RAP. SWFA scopes have a reputation for decent glass and ruggedness. They will constantly withstand the abuse of the reverse recoil from an air rifle when other more costly scopes fail. Maybe SWFA has learned to glue ALL their lenses in place, like NightForce. While their mil reticle is not as useful as the H59 reticle on my competition scope it works well for hunting, which is why I put it on my RAP.
BTW, get the Vortex.