Several of my electronics students bought them in hopes that it was the "wave of the future".
It is not.
It is supposed to work very much on the same principle as an arc welder, and it does, but that's not a good thing for soldering.
While it does work (I guess), I wouldn't go rush out and buy one.
Why?
The tip is too large for small work.
The power is not adequate for large work.
The tip gets flux residue on it and then can't make the electrical connection needed in order for the thing to work.
The tip is too fragile.
The tip is too flat for rework.
The tip stays hot for a good while after use (just like science suggests)
blah blah blah etc. etc.
Just thought I'd pitch in a word since I'd messed around with one.
The cheapest conventional iron works much better and will last MUCH longer.
Mr. D