I was fortunate enough to be matched with this opportunity via a prominent staffing agency. The first step was a 25-minute phone screen with a recruiter, who asked mostly behavioral questions with some inquiries about my current position. A few weeks later, I had a 40-minute phone screen with the hiring manager, who concentrated more on questions about my experience and transferable skills. They were very pleasant, and the conversation flowed well.
A few weeks later (the delay partially being due to the height of summer vacation season at Broad), I had 8 back-to-back 30-minute interviews with the entire department, and 2 administrative professionals in other departments. Each person had a list of different behavioral questions, but most of the interviews themselves were conversational in nature instead of rapid-fire questions. It was clear that everyone loved working at The Broad, and that each individual is the best of the best in their respective field.
Despite feeling like I performed well and was a good fit, I was not offered the position due to not having enough experience for one particular skill, despite being transparent about my experience with said skill throughout the entire process (which was proficient, but on a smaller scale than it would be at Broad) and said skill only being a small percentage of my day-to-day according to management. In my own opinion, I did not do a good enough job selling myself on how I could have been a true asset in the position and to the department. Nevertheless, it was a disappointing outcome.
Having said that, if you are looking for a great environment with room to grow, you should certainly apply here. Even though I didn't get the position, it certainly seems to live up to all the hype.