Keeping the knife sharp once it's sharpened is the trick to making the knife last... I've used several different brands of quality knives--henkels, cutco's, dexter russells--and even a $7 "Bill Dance" Rapala knife will hold a razor sharp blade fish after fish if you brush the edge a few times with a sharpening steel after each use. I cleaned several hundred fish this year--mahi, wahoo, triggers, etc---and after every 4-5 fish--I'd run the blade 3-4 times through either a steel or a "RADA mfg Co Quck Edge knife sharpener"
http://www.amazon.com/Rada-Cutlery-S...owViewpoints=1
The knife stays shaving sharp... It'll easily shave the arm hairs off--but in no way is it as sharp as this:
http://www.youtube.com/watch?v=qE_ZN1mHKvo
The next goal is to get that sharp!.. I've used the electric models listed above---tried the lansky set-ups--tried some stones.... I'm thinking either the paper wheel (and strop) and/or completely different knives is the key.