I own a few knives and use all of them. I'm trying to add as many different steels as possible to my collection. So far I have knives with M4, S30v, 8Cr13MoV, AUS8, and 1095 steels. I'll be adding more steels like M390, S90v, and Elmax in the near future. I need advice for a free hand stone purchase. I think that I'm gonna grab some DMT stones, but I'm not really sure if this is the way I should go. I have been reading about Shapton stones and I like that they cut fast and are available in several different grits. My only concern is maintenance. I know that diamond stones don't require much, if any maintenance. How much maintenance do Shapton stones require? Thanks in advance!