Haven't tried one, but the vid shows faults inherent in the system. If you have to 'double-check' for errors anyway, I wouldn't spend the $$ for it. And 'special black background' and 'changing measurements with diff lighting'? JMO
Just like the diff with CIP and SAAMI bullet holes in a target - do you subtract 0.19x or 0.22" ? I measure 3-4 bullet holes to get an average, on all my rifles.
