I have had the k60 for about a year now and I still havent had good luck with it. Did a root job yesterday from a basement clean out major root wad at 68' worked it over 5-6 times and only cleared about 40% of it. Went back today with the k7500 and destroyed the roots in one pass. I am still not sold on the k60. After hearing all the good things here im guessing its something i'm doing. Any tips or look for it to be up for sale here soon.