I don't like this type of iron because the tip is not grounded.
Most part don't have problems but a part that is commonly use
with arduinos is very sensitive and easily damaged with an ungrounded
tip of a soldering iron. That part is a MOSFET.
One of the other thread started about just such a problem.
The tips of these iron has a small capacitance to about 1/2 the line voltage.
Most parts have protection that can easily handle this small of
a capacitance. The MOSFET's input is essentially a capacitor. A small
capacitor. The voltage of the ungrounded iron can easily go over 70
volts, damaging the gate lead.
Dwight