I have a 7 inch electric, it is a stike master lazer electric without the battery. Check this, i got it brand new from a pawn shop in storm lake, IA for 75 dollars cash BRAND NEW IN THE BOX!!!!! that is $300+ auger…hahahaa
Back to your question, they are like a hot knife through butter if you have the lazer model. Just use a small 12v vexilar battery or similar and you can cut quite a few holes in little time. It is perfect for early ice and/or in your permenant fishhouse. GEt one you will not be disapointed unless you want to go through like 2ft ice, it will do it easy but battery will become and issue if you are drilling alot of holes, unless you have a deep cycle or a 4wheeler to jump cables off of.