Been using D806 heavily for the past 3-4 years - as a heifer bull, and to downsize some from the bigger high-percentage Simmental/Holstein-influenced cows in the base herd. Not at all uncommon for those D806-sired calves to come 2 weeks early.
First D-806-sired calf we ever had came *5 weeks* early - but I'm thinking something was not right about the cow - calf was small and weak, but we brought him to the house, dried him off, warmed him up and tubed him with colostrum. Took about a day or so, but he came around and was strong enough to go into the corral with his dam, and did just fine.
Cow did not breed back, and took a ride to town.
Have one WAVE-sired steer, out of a D806 daughter, born this spring, and a handful of Wave calves, born in the last month or so - couple of heifers, 3 or 4 bulls- they all look good, no flightier at this point than calves by 6I6, Waukaru Goldmine, or the cleanup bull. Time will tell. I've had reports from a fellow who has seen full-sib sisters of Wave, and they weren't nutty at all - but I've stopped using him until I see if I have any disposition isssues with the ones I've got. Still, calving ease, high $EN and $W, high marbling & REA sure make me want to keep using him.