Any skilled solderer can do it better and faster with a 25 or 50 watt iron
and a fine chisel tip, and any one who solders for a living will tell
the same tale.

Indeed, if you're going to do anything more than a joint or two it's better
to use a real iron.

Oh, they are also a pain, needing a ground connector as well as the
"hot" carbon tip.

The battery ones have both on the split tip. There's no other ground
connector.