I have 4 calves on the ground by Heads up. 3 are out of angus, and the fourth out of a commercial maine cow. They come small with lots of vigor and mature quickly. I like them. Like you I am going for replacements. My angus ones are better than my one maine at this point. One heifer in particular is really nice. Very cool front 1/3...which is why I tried him. I bred him to a couple clubby cows also, but they are 8 days past due so not sure I'm going to get anything there. For what its worth I put a straw under a microscope and the semen quality was as good as it gets. My calves are about 10-14 days old.