Don't believe the ads.
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=94739quoted from their ad-
-Dent pulling done with weld-pull and twist-slide hammer with reusable tips
-Heavy pulls done with washer pull tabs and bear claw wiggle wire
-Electricity used for sheet metal repair and dent pulling
-Spot welding is four to five times faster than MIG welding
-Electrode with magnet for washer welds, which produces no fumes and saves time
I found it when I was looking for a way to do one sided spot welding as well as looking for a stud welder for pulling dents. This looked like a one tool solution. I tried it with some scrap 18 gauge to spot weld and it just discolored the metal without creating a spot weld. I realize that 18 gauge is probably too heavy, but I don't think even 22 gauge would be faster on this machine than MIG welding. The washer welding seemed to work fine, but I really need to pull heavier metal as I am planning on doing more fabricating than actual body work. Not really what I had hoped for, but it probably serves its purpose well in other areas. I will be putting it on craigs list and maybe Ebay for $250 since it has only been plugged in less than an hour. I guess I will try the eastwood spotwelder next. Trying to find something that will duplicate factory spotwelds better than trying to fake it with MIG puddle welds. I will also be seam welding for added strength and performance so the strength of the weld doesn't bother me, I just want a car that looks more modified and upgraded than rebuilt.
P.S. I have Miller plasma cutters and two different Lincoln welders, but all my metal working stuff can't be $1000 machines. Sometimes these cheap Harbor freight things work out, sometimes they don't.