don't use it to weld roll cage tube, i had one like it and i found out fast 2 things 1) not hot enough for good penatration 2) duty cycle, i couldn't do alot of welding at 1 time.
i got a new miller DVI, it was $1300 but weld quility went through the roof compaired to what i had. i always took stuff to work and used there welder if i had anything important to weld.