10% Duty cycle @ 180A? She'll run out of steam when you start welding around 5mm material with your 0.9mm wire. 
There are better offerings out there, although that price is tempting for the home gamer. 
Stepwise voltage output would grow tiresome on some of the more tricky welding jobs.
I always get annoyed with the increasing nomenclature of 'Gas/Gasless' migs. As long as you can reverse the polarity and get a knurled roller to suit your machine, you can weld gasless. Likewise, stating machine 'Amp output' for a Constant Voltage power source like a MIG is useless- as soon as you change your electrode stickout, you've changed your effective amps at the workpiece, as the wire is your resistor!
If you haven't checked it out yet, this might be useful:
https://www.millerwelds.com/resource...ing-calculator
				
			 
			
		 
			
				
			
				
			
			
				-Mitch
'El Burro' 2012 Defender 90.
			
			
		 
	
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