I have a spyderco "H1 Stainless" steel dive knife which I do not baby at all and has not rusted and has kept a sharp edge. The only place it has shown rust is around the logo engravings, which I understand is bits of the tooling rusting and no the steel blade. 200 dives with this knife and I frequently forget to rinse it and its still sharp.
My same experience, Spyderco's H-1 stainless is awesome. More good news,about a month ago I visited the Spyderco factory store in Golden, Colorado -- it's about 90 minutes from my home -- and found out that they have begun manufacturing several more of their knife styles with their H-1 steel. Some day, maybe, we'll be able to get H-1 shears.
see: :: Spyderco Search Results :: and enter "H-1" in the search field.