I have a weld-pak, I cant remeber the model but itys the small 110v, I bought it and used it at my parents about 10yrs ago during my ill-advised venture into VWs...
BUt the lil unit is very soild, still looks new, the only problem I had was getting penetration with the crappy flux-core wire..but after 10 years now of doing heavy collision work and that experienceI can say my problem is the unit IS small for anything more than sheetmetal and as soon as I get a shop of my own I will be swapping it over to the bottle and 86ing the flux!
As long as you pay attention to the duty cycles and reccomended usage, the units are fine !
Now at work we use nothing but millers..every shop I ahve ever been in but one had em and had nothing bad to say about em! If i buy another one( upgrade?) It will Be Blue..