Been using the Metro Master blasters for years. Work great and huge power. A bit pricey. Anything STIHL is great but I am partial--been representing them 3 years. My only worry with leaf blowers is accidentally hitting the surface.
Also, the MetroVac has slightly heated air, which is nice, and it's filtered. I love mine!
Not exactly sure how the leaf blower is designed, but I believe it's just got a giant fan sucking air in and then blowing unfiltered air out. When you're blowing leaves, you don't care about picking up particulate matter and sandblasting it into your leaf pile. The car, however....