Set up mine today: 50yds came in very slightly under the mark on the scope, so set it up using that. 45, 35 and 20 were just about spot on, with 20 yds coming in at what would be between 19 and 20 yd mark. Lower marks were a little bit high - but less than a yard out. Scope was hot, had been in the car all day, so that may have contributed.
All in all, not enough of an error to worry about, and perfectly usable but the lower numbers (<20yd marks) could do with a tweak in position.