It's crazy nobody really knows much about these. But I have not used either yet. I plan on selling the MST 180i and keeping the 200 AC/DC tig. And then buying the multimatic 215. But I was also comparing specs of the multimatic 215 and the Firepower 220i since the Firepower machines seem to be of good quality. The 220i shows that it can go up to 30 volts so I could do spray transferif I wanted to. But the problem with that is even on the firepower website some of the info is not even correct. So I wonder if it really does go up to 30 volts. An example would be that on the website it says amperage range goes up to 150 but it goes up to 220.