Any users of this Thermal Arc mig welders (specifically Fabricator 181 http://www.thermadyne.com/evolution/...100&pdtnbr=575) )or have comments about them ? It looks like only 4 voltage taps, but I can get this unit for about 1/2 the cost of say a Millermatic 180. This only for occasional use around the garage so I don't know if I can justify the extra $ for the Miller