I bought this post hole auger based upon the reviews that I read on Amazon but I honestly had my doubts that I would be able to use it.  I am happy to say that my doubts were unfounded.  This thing works remarkably well.  I should mention that I'm a 61 year old female with wimpy upper body strength, so you don't need major biceps to use it.  It took a little while to get used to it and let the tool do most of the work.  But it's still work and I found that 2 holes a day were my max.  Like any manual post hole digger, it will not bore through big rocks, but smaller stones can usually be jiggled out by rotating the auger back and forth.  When that didn't work or when I hit a larger rock,  I used my narrow, long bladed transplanting shovel which was the perfect auxiliary tool.  A pry bar or some other long narrow tool would work as well, but my point is that unless your soil is totally stone free, you will probably need some other prying tool in addition to the auger.  The shovel also came in handy when the soil for some of the holes was fairly dry and trickled out of the auger before I could pull it out of the hole.  I used this auger to dig 2 foot deep post holes for a split rail fence.  It was the perfect size for these posts.  I am completely satisfied with this tool and can recommend it whole-heartedly.