Believe the RMDX is a little thinner and narrower than the Rodent 6--a little lighter and more agile. I've had both. If they did a drop point R-6 without the top guard, THAT would be the cat's meow!
The R6 is a full 1/4" thick, no? I don't believe the RMDx is 3/16"...just checked it next to a couple customs at 1/8" and it's a smidge thicker than them. Has a rounded spine- nice touch! <img src="/ubbthreads/images/graemlins/thumbup.gif" alt="" />