Used to create starter holes to 12" deep for planting 50 succulents in heavy clay soil. Excellent job for the first 6 inch width.  Used a spade shovel to finish widening the holes.  Did not work in heavily rooted areas as others have noted.  Minor roots to 1/2" were usually handled.  Handle was poorly finished and needed to be sanded prior to use to avoid splinters in my hands.  Pricey, but did save time and it worked different muscles than the shovel.  Much better than a clam type post hole digger for my hard clay.  Glad I purchased it.