HEY GUYS! need some info on a ECONOTWIN HF #JG081991, a friend of mine has one he took in on trade for another tig machine and said he would take $650.00 and everything i would need to get started it looks to be in good condition but i have to confess i know nothing about tig but want to learn how to weld aluminum . can any of you guys give me any info on this machine good , bad ,pros cons etc. thanks chris