Well, I don't know if they have AHB genes in them or not. In the past I got some hot bees, which is why I stopped using them until last year. As I said, I bought two packages from R. Weaver, because I remember them as being very strong hives, and I wanted a couple for comparison. They overwintered fine but have just been okay this season, not great, as in years past. They have not been particularly aggressive, either last year or this year.
Today, I went out to requeen them with some Sooper Yooper queens from Zia Queenbee. I figured I should do it before they raised their own new queens, since I've read that the next generation can be pretty mean. I expected the process to be kind of rough with bees all over me. I should mention today was sunny, low humidity, temps in the high 70's. And I have a head cold. The first hive I opened was very calm. This hive had appeared to be dwindling, but recently I saw signs of more bees at the entrance. I found frame after frame of eggs, new brood and capped brood. Very nice pattern. Calm bees. Could not find the queen. Broke down three deeps and had them spread out all over, but could not find her. Since her pattern was so nice, and since the bees seemed calmer than last year (kind of runny, so maybe she mated with one of my Russian drones), I closed them back up and used some of their frames to start a nuc with their Sooper Yooper queen.
In the other hive, the stronger of the two, I found no eggs or fresh brood, only a few late cells left to hatch. The bees were calm, although they got more ticked by the time I finished breaking everything down. They COULD have a new, virgin queen, but I found no signs of queen cells, either. So, I gave them a new queen and closed them up.
Summing up my experience today, I have to say that I found my Texas-sourced Buckfast bees to be amazingly calm, especially considering one hive had requeened itself and the other appeared to be queenless.
I have the remaining new queens (3) going in nucs as back-ups. But, overall, I am surprised and pleased with the temperament of these Buckfast hives. If the one that requeened itself stays calm, overwinters and survives in my no-treatment yard (which I did not expect, another reason I wanted to requeen them), then they may be keepers. Time will tell.