Steve,
I have a Strikemaster ice auger and wanted to plant trees this Spring so I went to Cabelas and bought a 5 inch hand auger in the bargain cave, sent for an adapter to Strikemaster, did a little welding and grinding, and proceeded to dig 175+ holes in just 2 or 3 hours. I was amazed at how well it worked. By the way, Strikemaster offers an earth auger for the powerhead but I was too cheap to spend the $100. If I had been digging in rocky soil this would not have been a great setup but in the woods where I was replanting trees it worked great. The ice blades did get dull, but still sharper than a regular earth auger blade so it cut roots like wild. Overall, I was pretty happy with the setup but I was only digging 5 inch holes. 