The Full Flat Grind RD9 had a coating problem so I stripped it....and I also broke about 3/4 of an inch off the tip while giving it some exercise, Justin Offered to regrind it....but I don't like sending my knives off and just did it myself. The old hollow ground RD9's coating is holding up like a champ and it is quite a bit thicker than the new one. I have been eyeing a BK9HH model and as soon as I see one...it will be added to the list. I wanted to add a HI Bolo in the BF exchange, but HI's warranty only applies to the original owner!? So now I can save my money for something else...like a DOG FATHER!