I think if you are an ardent collector the S5 and RMD are both worth having...but if your budget is tight or expenses elsewhere are heavy...then if you already have a RMD the S5 may be such a similar knife that you might want to consider the issue of duplication...but if you don't own a RMD then the S5 is a MUST....plus on the price it is good value compared to the secondary market price of the RMD...however on a specification distinction comparison...there is not much to seperate them IMO except the different grips and both grips are good choices!