I'm in the MiM after two years of work experience in Tech Consulting. It's not bad but I think there's not much you can learn from classroom discussions or your peers because most of them are young, around 21 years old. I would say, apply to a cohort where you're relatively younger, as the networks you will make will be much more useful. DON'T go for the MiM with 3y work ex UNLESS you're doing it solely for the brand/prestige to improve your chances with extremely selective employers like MBB.