I have run this wire recently as a test for a local lincoln rep. It is a decent wire, but very touchy to the weather. You have to change parameters on a daily basis if you live in an area like the northeast, where the humidity changes every day. Also you must have very clean base metal, no mill scale or rust. Running this wire has not changed my everyday fcaw wire, I use a Kobelco fcaw wire, i think it runs better then the ultracore and it is 25% cheaper per pound. People in the mid west may have better luck with the wire as they don't have drastic humidity changes day to day.