[mcguyver]

I only use a butane iron. The selection of tips determines how much heat you can transfer to your wire and solder, and how stable it is to temperature fluctuations from the transfer. This means less heat damage to your wire or connection points. Soldering should be nearly instantaneous, or your iron is too cool or too small. I use a 60/40 resin core for wire, and silver for motors.

I have been soldering with them for over 20 years, and with high volume I will have to replace a $150 iron once every 6-7 years or so.