I can say with absolute certainty that Cold Steel Secure-ex sheaths DO DULL EDGES. I have a CS Gurkha Kukri (SK-5) and a CS ODA (and others, but not with Secure-ex). Both knives go into the sheaths wicked sharp, but come out with a portion of the edges completely dull. Life sux. If anyone learns or figures out a solution, please advise. Thanks.
P.S. I just emailed Cold Steel to let them know of the problem. Let's face it... when concerned about a product, it's best to contact the manufacturer. I'll post the response when I get it.
P.S.S. Okay, I finally received an email response from Cold Steel. I was told to keep pressure on the spine side, and with the Kukri, draw along the curve of the blade. I was also told that if the problem persists, send the knives and sheaths in for inspection. That's pretty good customer service! There's another similar thread leaning more toward Ka-Bars... and one guy said to draw the knives a bunch of times to wear a trough into the sheath... and that'll take care of the problem. I guess I'll try anything.