I have both the 6 and 9 inch augers and they dig good. They best way I found is to dig at 540rpm and work it out often the deeper you go or it hangs up. I've dug roughly 250 since last year with mine. If you go down to 3 foot deep it hangs up often unless you have no rocks or roots where you are digging. I did 75 holes for a guy putting deer fence up and alot of them had to be pulled out with his backhoe.:thumbsup: