I got The Tweco 181i to use as a small MIG. I already have an expensive Miller Dynasty 280 Tig runner with water cooled torch.

The $599 is the Cyberweld price for the 181i, not the 141i.
MSRP is $939, but ebay and IOC are selling them in the $725-$740 range. The $599 is almost the price my old Hobart 120 cost me 20-years ago.

Being an inverter machine, it has a few features my older transformer based machine does not, and alot more power, but it is not a fair comparison when the old Hobart is a 120 Volt input machine and the Tweco 181i is a 230 volt input machine.
The Hobart has four basic volt-amp settings (voltage and current vary with wire speed) from 30Amp to 130 Amp. Rated duty cycle at 90 Amps is 30%.

The Tweco 181i output current ranges from 10-180 Amps. At 88 Amps duty cycle is 100%, almost 70% more duty cycle than my old welder. 180 amps is the 20% duty cycle rating. This machine allows setting the constant voltage output in GMAW (MIG) mode, or constant current in SMAW (Stick) mode.

Once I get it, try it out, and I'll post how it does. I have several 1/4" and 3/8" steel coupons already cut.