I have had mine (#20) for a year now, mounted on an EV2 used for FT comps. Not a single problem with it, still clicks well, and as said by the OP, snaps in/out of focus better than a lot of `Diamonds` have tried. yes it does have a 2 yd shift at about 14 deg C, but once you have sussed that, its a lovely bit of kit to use..... Its just let down by the `squidgy bit of biomass` holding the rifle.
PJ
FX Verminator .177, Baikal IJ 38. 177, Gat gun .177, Haenal 303 .22, HW77 x 2 .177, Diana mod 27 1929 .177. EV2....... midshiresmarksmen.com