It seems to me that while its already been discussed that when flying an approach to weather minimums crews should have briefed both the approach AND potential missed, and that the PF should at least have mentally gone over the missed approach (go around) procedures--memory items et al, but the idea that you disengage the AP at minimums (or near) or that you engage it at the start of the missed IMHO is, at best, poor practice, and I would hope, contrary to SOP's. It was for us. You want to fly the approach manually-- disengage at the IAP not the DH(A), and if you miss, you stay in the mode of flight you were in during the approach until you have a stabilized go-around established. I'm just sayin...