I have lamented on here before about how the 4 mix Sthil came out right after I had bought a Sthill 400. Thinking I had bought the most powerful Sthil blower, I was not too impressed with its power. But, let me tell what the 400 will do. It will change the direction of a cat. I'll try to explain. I was blowing off a carport of one of my customers and noticed the cat box and was trying to get some leaves to come loose from under it. I had no idea the cat was "at home". Well, he stood it about as long as he could,I guess, and decided that the world must be coming to an end. He exited his abode about the time I swept around to the front of the box and as he turned to head to the back yard and safety, I caught him right at the hind legs and the Sthil 400 turned him a half turn around and headed him in the opposite direction. I said "don't mess with Sthil boy". Actually when he came out of that box he scared me about as bad as I scared him.