I've got 2 Lincolns (a Weld Pak 100 wire feed and a AC/DC "Tombstone" stick) and a Hobart Handler 175. All good welders.
Hobart is owned by the same company that owns Miller and there's some Miller parts in mine.
Despite what advertisements claim, the 110 volt wire-feed units are realistically only capable of around 90 amps. There's an extensive thread on weldingweb.com a few years ago that took actual measurements of the so-called 140 series...bottom line, they pull 20 amps which is most a common 110 volt circuit can supply, and after you go through a transformer and rectify it, then the power output *at a useful welding voltage* is only 90 amps or thereabouts. The 220 volt models run from 175 up to 210 amps output typically, with the differences being in duty cycle as the price range goes up.
IMHO, a 110 volt unit with flux core wire is extremely useful--within its limitations. They are great for portability. The flux core is ideal for outdoor windy conditions and also useful for out-of-position welding (vertical and overhead). The thickness range for a 110 unit with flux core is (subject to some debate)...probably around 1/4 to 3/16 or thinner. I say probably because to weld 1/4 requires a clean surface with no paint or rust, good fitment, and good skills, weaving on a horizontal weld, and even then its not really ideal. I've welded thicker with mine, but it gets ugly and it's not a quality weld. The thread on Weldingweb showed that the 110 volt units did NOT have enough heat to get good fusion on 3/8 inch material--the metal soaked up too much heat. I beleive they speculated that with some preheat, perhaps the 110 volt units could be pushed to weld around 5/16 inch or so but 3/8 was outside its range.
For material in the 1/4 to 3/8 inch range, the 220 volt MIG's such as the Hobart 175, 180 or 187 work very well. For 1/2 inch and thicker, multiple passes are required and I'd reach for the stick welder then...