Remodeling our stairs from Carpet to Hardwood,  Of course the walls aren't perfectly square,  I sought a tool to help in the measuring and marking of the new treads and risers. I've got 29 steps in my house and tried to do the first 7 steps w/o this tool.  This tool works great,  cut the time in more than 1/2 for me- took about 4 hours to do the 1st 7 steps w/o tho Stair Wizard, and less than 2 hours for the next 7 with it.  Made measuring and marking a breeze.