The main problem I see w/ any of the inverters, is getting enough power to the inverters. Many construction sites don't have enough temp power. But realize that I'm talking structural steel & FCAW (usually NR 232 .072", which usually means a high duty cycle @ around 300 AMPs), not pipe welding. Once enough power is available, Both Powcons & Millers seem to work just fine. Although for some reason, I not sure why, I kinda like the millers better.