Has anyone ever used one of these to keep their DE blades nice and fresh. I ask because a few days a week I shave at the gym with my DE and am constantly replacing blades. I switched to DE and straights because I wanted to try to save a little $ on my daily shaving (this is before I caught RAD). I was thinking about getting something like this to freshen up a blade before I left for the gym. Any thoughts? Would I just be wasting my hard earned cash?

BAKELITE SAFETY RAZOR BLADE HONE STROP SHARPENER x - eBay (item 180222218604 end time Dec-03-08 10:11:33 PST)