call me old fashioned but i don't prefer the kit type sharpening systems. I have too many friends and co workers that swear by them then at work they ask to borrow my knife as theirs is already dull and they can't or won't sharpen them with anything else. I carry a diamond stone made by EZE Lap in my back pocket to touch up my knives after cutting gasket material, rubber, tape off of pipes and other things i run into at work. But to each their own. Also when there isn't much going on at work i tend to touch up my knives when there is down time. Considering i am quite blade heavy in my EDC (currently i can think of 7 knives) I find the task of maintaining them pretty easily because i carry a stone.