A diamond sharpener that has a couple of rollers to align the blade, drag through about 3 times, 2 pads, start coarse then fine, when they get a bit sad time for Mr Tormek to make an appearance (mine is a clone by Record), spend about an hour doing the lot probably twice a year.
Knives are mainly F Dick which are carbon steel but SWMBO has some SS, they are useless and won't hold an edge.