I have one. I don't play with anything less than level 5 doctor.
PR is always at least at lv 4. I tested all the guys. Even a lv 6 PR. Thanks to this I know exactly when I need which level and what are their benefits
For 99% of the managers at BB the staff is just a way to lose money. I have a different opinion and every level and speciality has its strong points. But there are situations where a high level PR is real gold and situations where a lv 1 is enough ;)