Anyone used both and have feedback from using both? When I was working in a shop we only ran straight CO2, and for home use I had a couple soda cylinders with plain CO2 as well. I've read the Argon mix lays flatter beads with a better appearance and less splatter, though CO2 has better penetration. Being a cheapskate, my inclination is to keep using straight CO2, but if I fab stuff to sell, might look more blingy with the mix. Feedback from experience welders that have used both?