I have studied at HB. It is a good school if you choose the right teachers. The teachers can be very hit or miss. They allow you to audit a class to see if you like the teacher and I would suggest that you do that.
I don't think that HB is very strong as far as musical theater. I would definitely suggest a class with Helen Gallagher. She's excellent. Also, Austin Pendelton is good for acting. But you might want to look elsewhere for musical based study.
If anyone ever tells you that you put too much Parmesan cheese on your pasta, stop talking to them. You don't need that kind of negativity in your life.