I'm after a diamond grit sharpening stone. I intend to use it for general purpose sharpening, as well as flattening my Jap water stones.
I notice that "DMT DiaSharp" seems to be a premium product in diamond grit sharpening stones (judging by the price, at least). On the other hand, there are a lot of cheapo items on eBay that are less than half the price of a DMT of equivalent size.
My working assumption is that the DMT products will be better made (flatter, more durable, more uniform grit etc.), but does anyone have anything positive to say about cheap diamond grit sharpening stones? Source?