TimWieneke:
I own three Master Hunters. Bought factory seconds. Blade shape is OK. Flat grind I think is more durable than double-hollow grind. I especially appreciate the grip. Unless your hands are thickly covered with grease, grips are sticky, easy to use -- very safe.
Contrary to its chemistry, I find Carbon V blades more corrosion resistant than one might expect. Edge stays sharp, in my opinion, better than 440-c or ATS-34. Blade is MUCH EASIER to sharpen.
I have a thing about rust. I picked up five TwistMasters very inexpensively on close-out. On the one I use, I cleaned the blade and sprayed the pivot with LPS-3. This was two years ago. I carry it in my pocket, not in its belt holster. I wanted to force myself to see how bad, and uncomfortable for me, the corrosion would be.
My gut is still very queasy about using non-stainless steel knives. I would never buy another. But I gotta tell ya, the steel discolors. It has been difficult to induce ANY rust. When I have done it, the corrosion is slight, and on the surface. It comes off by washing the blade with dish soap and scotch brite sponge.
I DO NOT "PRESERVE" THE BLADE. I merely dry it. . . . I guess I'm still "testing."
Don't be put off by Cold Steel's hyperbole. Master Hunters are nice machines. I strongly prefer the TwistMaster Clip Point shape. It is a Marble Woodcraft with more dropped point.
I hope this helps.