tbh, I think it sucks. I feel like if I were able to hit one body part a day, I might be able to handle more volume than I can now because the day's calories would go mostly to that one body part rather than two, or I would be able to progress faster because I'd have more energy to devote to each lift.
also, as of now I'm still progressing decently but I think that if I ever start hitting big numbers on my lifts that working two-a-days in this style will be impossible. for instance, my squat working weight is only 205 this week. I think that once that gets closer to 3 pps that I'll be too wiped out to do a second session. I'm not sure how much more I can increase my intake to mitigate this as my meals are already man vs food challenges at only 3.5k cals and my GERD is creeping in.
if this does happen in the future, I might be able to do a smaller body part as the second session. of course, I won't know until I get there.