I bought this not expecting much from it, but for what it is, it's performed just as well if not better than the Mastercraft brand MIG/Flux core welder I currently have. This one does AC and DC power, and will easily weld 1/2" steel (thickest I've worked with). Out of the box it works with 0.030" wire, and 0.040" wire. It will handle 0.035", but you will have to buy a wheel for the wirefeed, as the ones it comes with only do the two aforementioned sizes. I found this out the hard way when I realized all the rolls I have are 0.035 wire, so I had to buy a roll for it. Not a big deal, it takes a standard square centered wheel, so most welding supply shops would carry it, or 鶹.
The welder itself works on 'quick connect' twist connections. Interesting concept, although I do notice that if I'm moving around alot, sometimes the ground wire likes to twist and come undone. Easy to notice though, as the welds start getting spotty. I'd rig a way to keep it permanently, but since you need to switch polarities for flux core and stick, I just settle with double checking the connection before I start welding.
Duty cycle on this is 60% @200A, and 100% at 95A on most voltages I believe, which beats out my Mastercraft as well. The wire feed stinger is fairly sturdy and seems decently build. It has a rubber jacket that covers it, and is reinforced with a slight spring near the connection to the unit. The arc stinger is a tad cheap, but it holds the electrodes securely, and doesn't get hot while welding. The ground clamp is a fairly beefy and strong clamp, holds well to even thin metals, and does NOT get hot in the slightest while welding.
All in all, for $200 ($30 cheaper than my Mastercraft ON SALE), I've put this one to more use than the Mastercraft, which has now been relegated to the backup welder, while this little unit is my daily driver for most tasks.