ah, yea I haven't tried those. ive been using my 90A HF 110v flux wire feed welder for years without problems. ive actually never had it turn off cuz of duty cycles (for better or worse?) and i know ive welded for more than 1 minute in 10. (10% duty cycle supposedly) so yea, whether that means it's actually better than written or the overload safety isn't working, this i don't know.
if you're looking at spending $250 on an HF, just add another $100 and get a real brand welder. if mine craps out, i'm down $65 after 3 years of use, which is pretty fair, but i wouldn't risk losing $300 without any way to repair or parts to get.