I received a factory new Swamp Rat RMD that had an incorrectly ground "V". I tried for HOURS to get it sharp enough to cut paper, but no avail. Eric at the Swamp sent it back RAZOR sharp. I actually have a couple of "safe queens" that don't "look" sharp as they've never been used to cut anything. The angle of the final V grind seems to be too shallow on a few, but as these are EYE CANDY and not USERS I don't care.
Lifetime means lifetime...so if you ever have a problem they will take you. Period.
My 511's are sharper than some of the other Bussekin I've received factory direct. Honestly, I prefer to "tune" the edge anyway!