I built up the QA Team from 1 to 8 team members. Went from waterfall to agile in 2 years. The experience was invaluable and has enlightened me as to how to do it right and be successful.
This was probably the best job I've ever had or will have. The people there are all concerned about working together, rather than worrying about only their jobs. They are committed to the people around them, and to the job at hand.