Maxstar 150 units are revised as of serial number LF 010173M and after

These units have both hardware and software modifications resolving the
'stuck at low initial amp setting' and 'flashing power light requiring
reboot' problems. This revision should allow the use of aluminum stick
altogether and better versatility with 1/16" standard stick electrodes
on the low end.
If you're a prospective buyer, check the serial number before you buy
it.
If the revisions work, this unit will have no competition on any
dedicated 10 amp 120v circuit :p) Its Power Factor of .95, among other
slick, slick electrical engineering tricks is MAGIC.