Not sure if I am comparing apples to oranges in regards to a small portable, carry around type welder, but I bought a Miller, one that had one end of the male plug turned horizontal, (30 amp receptacle I think) it cost about $900.00 in '03.
The reason for the purchase was to reduce labor costs, I had 14 Ironworkers on this particular job I was running and all the structural connections for the giant windows we installed had 1/4" thick square washers in the fastening detail, that required to be fully welded to the 1/2" thick steel angle/bent plate clip we used to fasten to the building. With so many of these to do, and being a high rise building, metal stud walls went up quickly, no more open decks and the temp power drops for a buzz box, just getting set up to do 1-2 floors from 1 location was a nightmare. So I bought one of these, you could carry it with you, plug in where needed, (well I think they bent the plug end so they fit all the regular plugs).
I worked out great, the welds were 1/4", single pass, maybe 1" 1-1/2" long, I put an old timer on it, easy job, done any other way, too much labor just to get an arc going. I tested this thing out, first started welding then too, it would burn 1/8" 7018 stick, and I could make a professional looking weld with it, only down side was the duty cycle, it was short, you could easily trip it off, but this was still productive with the intermittent down time between welds because they were spread out anyway.
I should have delayed these welds, they had to be inspected prior to the walls being closed in, could have raised a fuss about the electrician providing drops for a buzz box on every floor, GC/CM had some people who were being real jerks to us anyway, they owed us temp power, but I opted to avoid the conflict, would have cost em too, union wages, that little Miller, not even sure of the model, it would fit in a back pack, was well worth the labor savings for the task at hand, at that time Ironworkers cost the company $98/hour.