The guys that installed this box said it was the most complicated one they've ever had to put together, made no small amount worse by the fact that of the 9 multiwire branch circuits, exactly 0 were labeled or had handle ties on the old box, so they had to find them all.

As an added bonus, the MWBCs meant instead of GFCI breakers we just had to stick GFCI outlets all over the house. And of course the house circuits are so damn random you could lose lights in the garage and have to figure out you need to reset the GFCI in a wall outlet of a bedroom on the other end of the house to get it back, so all the GFCIs had to be the kind with alarms so you can actually fucking find the damn things.