Pros
In my dept., the doctors and nurses were incredibly smart, proactive, and hardworking. All of us shared a universal disapproval for the mid-upper echelons of administration. Some exposure (though limited- you will be doing monkey work all day at a computer) to medicine was rewarding. I've had three positions at MSK within 2.5 years. I was promoted after ~10 months at each position, which seems like a positive at face-value but was merely a way for the organization to keep hiring costs down and milk my work ethic entirely. My advice: if you can, use every cent of tuition, use every paid vacation and sick day (I didn't), and get recommendations and shadowing if you need it. If you have time and your management aren't afraid of you furthering your intellect, definitely attend some of the lectures in oncology breakthroughs. There is no other benefit or pro; the place is falling apart inside. If you are a mediocrity reading this, there is also the benefit of job security - MSK makes it impossible to fire people and as such, rewards mediocrity and stifles innovation. One of the departmental directors has a huge lawsuit for assault and just kept getting promoted upwards. This is probably a common occurrence at MSK.
Cons
I learned former coworkers (after my promotion) made $20k/annually more than me. In result, I earned less at a higher-pay grade letter and despite a giant workload that had me working upwards of 12-13 hours a day and on weekends. I got the joy of constant bullying and hostility from insecure middle-managers who have failed not only at their own dreams (most wish they could be clinicians and will try to say snide or discouraging things to you) but have failed their staff and department. They enable a culture of pure toxicity. You will get emails at 12am from supervisors who are working on tasks like feral animals because they themselves refuse to hire more people (even when they get budget approvals for this very thing). You will attend constant meetings and have to make up for all the work missed while your bosses were twiddling their thumbs in Zoom and forcing you to listen.