Sold my Lincoln 135 Pro Mig to buy this unit. The cart needs a better design to allow the side door to open, (easy fix by flipping the top self over and lowering it in the back. The standard gun with infinite adjustability on both wire feed and voltage gets great penetration with steel. Swapped on the spool gun and the pure argon tank and was amazed to see how effectively I was able to weld alumni with only 15 to 20 min of practice. Extremely happy with the kit. Helmet is a god send over standard flip masks. Welder works great on everything I've tested so far from steel to aluminum . All I would suggest is a better design on the cart to make side door access better and to make it carry 2 tanks one for pure argon and one for CO2/ Argon mix