What I normally use is a Sharp Maker, they every once in a while I get a dmt diamond stone and try to make sure that the edge is all that it can be, and this causes the knife to get duller so I take out a ceramic rod from a lansky set which is nice but set at different angles than the sharpmaker, so I just use them free hand. This is pretty good and so far had not resulted in cut fingers. But then I go read the gun nuts blogs and Dave Peitzel says to use a motorized belt grinder from work sharp which seems to be very expensive and require power and new belts, and also he recommends 2600.00 binocs so I have to wonder. And then I read the reviews in cooks illustrated and they say to use the ChiefMate 110. but in truth the vibrating abrasive makes it hard to keep the knife on the guide ( also the magnetically charged steel dust is a bit of a mess ) so they I go and try the hunter honor which seems to have no effect on blades, but helps axes be sharper. Then I get a cup of tea and put a 30 edge on my knives with the sharpmaker and then back bevel the blade with the fine stone to 40 degrees and quit fiddling. The big problems are it does not work on big kitchen knives, and if you need to really re-profile stuff you might need a super course stone.