Flux core uses no gas, good for welding where its windy, but it sucks to clean up after you've been spoiled with gas shielding. Gas Shielding uses Argon instead of the flux core. They accomplish the same thing, they sheild the molten puddle from normal atmosphere until the weld cools enough to solidify. I have a Miller 130 (the 135 replaced it) and a friend who went in with me on it welded a full size pickup frame he cut in half back together with it and it's a 110v version. I do recommend a 20A circuit for it also. I've used it and never tripped a breaker, but I'm also not welding 10' beads either. For most home shops, a 110v unit is fine. I can't believe how someone can get by without a MIG. Even not on any projects, I probably use it once a month just to fix things or fab up something around the house that I need. I've made a T-post driver out of a Sch. 40 galv. fence post, a piece of 3/8" strap steel, and some rebar. I welded up a chain link gate frame instead of spending the money on those worthless expensive clamps, I've fixed my Snapper Rider countless times. Right now I need to weld a nut to the rounded off oil pan plug on the Isuzu Amigo I recently picked up cheap. Best money I've ever spent on a tool next to probably my Cordless drill.