They are nice but mine had an aluminum impeller on a steel shaft, I cursed that thing so much becuase it would not come apart. That machine cost me a fortune. For 4 cents worth of never seize it would have cost billy goAt to put on, it cost me dearly to replace the machine with a Toro vac, right when I needed it most, in the spring to clean winter debris. I had 6 good years of service but at almost $150 plus a year, I would have to say I.M.O not a good rate of return. You can buy the Stihl bg blower with mulching attachment if you dont need commercial speed and volume for less than half the price. Also if you dont want to such up the junk, blow it away.