Biostatistics

What is a career/masters in biostatistics like?
How much writing is involved? How much math is actually involved?
How much do you really get to hear/learn about the science of the research and not just about the numbers?
Do you understand the gist of what your working on or are you basically just handed a list of numbers and asked to make sense of them?
Is the pay worth the job/education to get there?
What was your undergrad in?
Would you change careers/majors if you could do it again?
What are the best and worst parts about the career?

I know this is a college board so I may not get many answers, but thought it would be worth a shot anyways!