I have one of these and love it. I just got another small roll of flux core wire and will use it with the c25 gas. This process is called dual shield welding and produces near perfect welds for newbies. Before I bought the welder, I took a refresher course at the local VoTech school called "Welding for Gearheads". I got to use all the welders in this Saturday afternoon class, OxyAcetylene, Arc, Mig, Tig and Plasma cutters, too. We used the Lincoln and Miller units. I was able to drop some bad habits and develop my skills. One guy brought in a HF flux machine and it was OK, but limited

If you are welding outdoors with any kind of a breeze around you the c25 envelope will be blown away leaving you with a contaminated weld.