I owned two of the original one's, the first one developed a fault, it lost zero and turning the elevation did nothing. It was only used on a Webley FX2000. It was replaced under warranty.

The replacement developed the same fault some months later, you could hear something rattling about inside. I never got round to trying to get it repaired, shame as they do have good optics and were one of the first mildot scopes available for reasonable money