I worked in the auto industry, with 27 automated mig systems running 1000 lbs spools of 0.045" E70S-6. Early on we had problems with extreme variabilty in wire cast, from spool to spool it could change from 30" to absolutely straight, not condusive to repeatable results. We also had issues with poor splices in the wire. Based on our comments and requests, Lincoln bent over backwards to perfect that wire package for us, and it perfomed flawlessly for the remaining 6 years I was there. I don't know about the cost breakdown or comparison to other suppliers, but as one of the engineers on the line, there were plenty of other problems, we didn't need to mess with wire.