It wasn't mentioned that these cheap iron usually
don't have temperature control.
This causes problems.
One is that they over heat, possibly lifting pads from
circuit boards and oxidizing the tips quicker, requiring
more regular cleaning.
If the tip is uncoated copper, it will rot out faster.
If iron clad, it will need more aggressive cleaning that will
cause the coating to be damaged.
One of the biggest problems with new people using soldering
irons is not keeping the iron clean and tinned.
The other is using the iron to transfer solder to
the work, causing typical cold solder joints.
As for grounding, one can add a clip and ground wire.
A light dimmer makes a coarse temperature controller.
One can get a inline dimmer for an incandescent lamp.
Still, I would not go for cheap when used for tools.
I've wasted a lot of my hard earned money on bargain
tools. I'm too old now to even think of using cheap junk.
Dwight