This thing is amazing. Small and light but hit the arc just as well as the heavy name brand welders I've used. The only complaint is the location of the switch on the back. The welder is small enough to be easily accessible, but I prefer to have it right in front of the entrance so you can see it if you need to turn it off in a hurry. I have welded 1/4" and 3/8" steel with good penetration. I recommend this product.