That tool really eats through the looser rock. On the harder stuff, it will impact the blade so tight in a crack that I have to remove the blade and use another to remove it. Alot easier on the body, arms, but dont forget the safty glasses.
I used to use one dredging when I ran the 263 compressor.Was a little loud under the water but really handy.I run a T-80 now so really dont have enough air.