Well although I did know my evaluators to a degree, it was not really on a much personal level. The reason being is that my science courses had anywhere from 50 - 300 students in the class, so it was hard to get to know professors on such a personal level. That is why I suggested the meeting in my previous post. If you did well in the class and showed up at office hours or such, they could mention that and that you took initiative in coming to their office to ask questions, etc. I really don't know what else a professor would write, but I know I had a good LOE from the dentist I shadowed, who knew me a lot better and could include things I did during the time I shadowed him.