How many sharpenings before they change the edge geometry so much that it must be completely re-shaped again?
I bought on on Clark's recommendation. $7.00 shipped from Amazon...how could you lose? Well, the darn thing works like a Mofo. Would not use it on any nice blades but put a quick shaving sharp edge on a knife it does. I've heard about and seen a lot of claims regarding quick, cheap sharpening tools but this one is as advertised.
As to the question above...I guess time will tell.
