They're not fool proof yet and can take a bit of tending unless you really spring for the top of the line. Particularly important is the blade pitch, on the mor

They're not fool proof yet and can take a bit of tending unless you really spring for the top of the line. Particularly important is the blade pitch, on the more affordable models that has to be set manually and if you go too fast with an aggressive pitch intended for a lower speed you can break the unit very quickly.