Despite other peoples experience the AC/DC in this class are "all that" and then some. They are highly under rated in terms of duty cycle and the only thing an Idealarc or Dialarc has over it is more top end power.
This is especially true for a first time buyer, all the way up to someone with excavating company and even then it would have its place.
The arc is so good on these that in a blind test I suspect only a miniscule few could ever tell the difference in this and a machine used on a power plant, put it on the other side of the wall and never tell.
The fundamental improvement here would be operator skill,,, way larger factor than the machine even at expert level, some fresh rods on the verts and preclean the plate would help a lot too.
This is a lot like riding a bike,,, my brain says I still can do it but you do lose motor skills not used. It would take a little practice, about a week to 10 days and a dozen rods a time to come up to speed.
In general fab and equipment repair like we do supreme quality is not needed.