I am setting up a basic electronics/robotics lab at my school. I have been trying to figure out what a good soldering iron would be for the classroom or if one of the kits available, which contain other useful tools, are viable. This is a class/club where both the students and teacher (me) are relatively inexperienced. We bought some cheap soldering irons last year but they are already useless and I don't want to make the same mistake twice. So, I guess I'm looking for warnings as much as recommendations.