My ds7's teacher was amazing. She had some tough situations, but had open communication with the parents, and spent a lot of time on respecting each other, and making the classroom a positive place for all. My ds was one of the problems, and she didn't hesitate to call me and let me know the problem, as well as how she would handle it in the classroom (a boy in dd7's class had similar issues, but the teacher would tell the mom, and not mention what she planned on doing - drove the mom nuts).
ETA - forgot dd9's teacher, only because my older 2 had him, so I knew going in what a great year it would be. Dd is always saying how great he is, how much she is learning, even stuff he doesn't have to teach them (ie - she now knows how to write checks and keep track of her checking account, how to write up a paycheck, including taking out for taxes and ss). He's the toughest teacher, but definitely the most creative and exciting. He's going to retire, thanks to Corzine, but already signed up to be a sub (he also has a law degree).