Having owned both the DMTs and DC4, I would stick with the DC4. The DMTs just don't seem to be as effective at getting a good edge on the harder Stainless Steels. The DMTs are perfectly OK for the softer steels though i.e. Victorinox, Leatherman 420 and 440Cs etc but seem to struggle with the harder stuff like ZDP-189 and Lam.SGPS etc
The DC4 is not to expensive either compared to 2 or 3 grades of DMTs
Hmmm ... that wasn't the answer I was hoping for. It wasn't as much the cost as the fact that I could pick up one of the DMT products easily when I stop by MEC to get a few supplies before my next trip instead of ordering a DC4 online (I hate paying for shipping, but then usually end up buying more than I intend to get the "free" shipping!).
Thanks for letting me know though, I guess I should start shopping around for a DC4.