Just to add my bit... If you can set the wire speed, try to set it as fast as you can handle. If it's too slow you give the heat a chance to spread and blow holes, you want to keep touching the trigger and leaving neat little pools about an inch apart, then go back if necessary and add more...
I bought one! I contacted Static Art and they bundled the welder and all the goodies together to get it to work in MIG, TIG and MMA. It's a lower power machine, so if you want to weld RSJ's, it's not for you. The MIG system works a treat, with infinite control knobs to really crank down the...