I have the sharpener with the sandpaper and think it works OK. I do not think that is one sharpens to a new blade but it will help to make blade sharper but not like new. Also if there is a nick in the blade it will not take it out. Buy it at Joanns with coupon and it is worth it. All that said- I use the carpet blades form Harbor Freight 2 blades for $2 so I really don't care if I sharpen a blade.