I don't like the dials on the machine, IMO take a look at the thermal arc arcmaster 185TSW or whatever it's called nowadays (I have a prowave 185TSW but I think the name changed to arcmaster)
it's gut a full digital readout and a pulse feature which is very nice. And it's a quiet machine in AC mode. Compared to my old Hobart and my buiddies Kemppy it's really quiet, the others make a racket in AC mode.