I have used the Aquatic Vegetation Groomer and was surprised to find that there is (in my opinion) almost no danger contrary to the posting above. The reason? It runs at such a low RPM and there is nothing spinning - it reciprocates. I dont know if I could have hurt myself even if I tried. It worked good for trimming along the pond edge. Why - because with nothing spinning (such as a brush cutter or whip) it didnt throw the small fragments into the water - they just fell over. Thats why its the golf course's favorite tool - they can cut near sand traps or ponds and not have stuff flying everywhere. Thats my 2 cents!