Something about the bottom brackets.
I have an M9 here and the Bülk. Before that the SL.
With the M9, the bottom bracket slide is attached from below and with the Milan and Bülk it is placed on top. With my Shimano shoe size 48, you can believe me, the crank circle is fully utilized. I use 155 cranks on both.
The axis of rotation of the bottom bracket in the available space of the crank circle was slightly different on the M9 and the SL. They were about 10mm apart.
So I had two pairs of road bike shoes and different cleat positions.
So I immediately noticed that the Bülk and the M9 have absolutely identical positions. So if you come from the alpha series and sit in a bülk, you won't have any problems with the position. If you get out of a Milan SL and then into the Bülk, you have to adjust the cleats if your feet are too big. With shoe size 44 it is not even noticed!