I went a different route when it came to a soldering iron. I use a Weller 90/120W soldering gun that is about 30 yrs old (maybe older according to my dad). Most poeple think this is too much, but when it comes to batteries, 12 AWG wire, and copper headed motors.... I can't imagine not having it. The other good thing in my mind is the way it works. It only gets hot when you pull the trigger and the rest of the time it doesn't consume any power. I don't know if this setup is the recommended way of doing things, but it works great for me.
Brushes? We don't need no stinking brushes!!!