I broke one (a 3-9) when it fell onto concrete with a rifle on top. They replaced it. I've had a lot pass through my hands, other than the obviously abused one (the turret spindle bent) all of them worked correctly. They were head and shoulders more reliable than the Leupold collection they replaced.
I mostly shoot with Bushnell's now, but not because the SWFA SS's don't work well. I've actually stopped being paranoid that my zero has shifted, but it's taken a while!
