I've already dropped $4,200 on the first of seven of these for my firm. For a year of daily work with the guys from Central Asia, I changed the brushes once (it's hard to find the original ones). All died in half a year, and these plow 4–5 times you change the brushes; then the anchor just wears out in 1.5–2 years of work; and the cords interrupt this daily sawing with squeals; otherwise, it's just a bomb. And if you use it as your own personal residence, it will serve you well for the rest of your life.