I have to disagree that to much heat is a great problem. I've seem more poor solder joints on electronics due to to low a heat from the iron. With low heat and a small tip, you ruin to much adjacent circuitry (especially small track on printed circuit board) than were ever destroyed by to hot a tip. Yes , temperature is important but more joints are ruined by to low a temp iron than by to high. If the joint is clean, flux applied and the heat applied only long enough to flow the solder, high temp makes the better and quickest connections.