Yeah, I am aware that Husqvarna.com says that the 150 is a "commercial" blower. It also has different air output specs between the 150 and the 350. How is this possible when they both have the same engines and blower mechanism? The 150 is a stripped down version of the 350 that was made for Lowes to lower their cost to meet a pricepoint. The next time you are at Lowes look around and see if you see any commercial power equipment, the 150 is no exception. The magnesium crankcase, high volume air filtration, improved starter mechanism, improved crankshaft, cylinder piston assemblies is what separates the 570 and 580 into the true commercial blower category. Not trying to bash the 150 and 350, they are both decent blowers. Just the next time you are in the market for a blower check out the 570 and 580. You will see the difference. I sell pallets of all these models every year but when I put a 350 in the hands of a commercial guy I get complaints.