Hey,
If you do a lot of chassis building, soldering in motors, aka anything that needs thermal mass to transfer heat while preventing cold solder joints... buy these:
https://www.newark.c...HP-STM7REC-RP-1
https://www.newark.c...HP-STM7REC-RP-3
I've tried a lot of the digital pencil soldering irons on Amazon and none of them actually draw their "rated" power. This one is an honest 150W+ draw (measured) iron that has on/off control and lets you select temperatures. I'm able to use it for everything since you can be very quick with it vs. having to hold it for long periods of time to warm up the surrounding joint areas. It is very quick to get up to temperature and the larger tip has some good thermal mass to it.