When I told my family I was going to sand and refinish all the redwood siding on my two-story house they thought I was crazy and that I would soon need a chiropractor, or worse. But the dual sanding modes of my new Rotex RO 150 FEQ 6" Rotex Dual-Mode Sander and a couple of boxes of Cristal 80 grit made the job incredibly fast and easy. A couple of weeks later, working just afternoons and weekends, I had a house that looked better than new and not a single kink in my back.Michael T., Massachusetts