Finding a good iron that can solder the Deans is hard these days.  You used to be able to go to Radio Shack and have a good choice of guns and irons, but today, there are mostly cheap irons that fall apart after a few uses.  I have a GOOD Snap On soldering gun with multiple tips for different jobs, but the tips are no longer made.

I replaced it with one from Sears that seems to work pretty good, 450 Watts to heat it up and then down to 100 watts to stay hot.  You can't solder the Deans with the 14 gauge wires that are on the packs I have with a 20 watt iron.