i really like ours this year. have pair of ET heifers on a Draft Pick x Black Irish Kansas x angus donor that are the best of the group. couple of bull calves on sim/angus cows. seems to work best on those soggy middled simmi based cows. Like CAB said, not low birth wt but all have been unassisted on mature cows. He has consistently thrown great hair, bone, and a big hip with above avereage foot size for a clubby bull. We will use him again.