To say any knife has advantages and little to no disadvantages is inaccurate.
Any blade will dull eventually. yes, even Cutco's Double-D edge will. If Colobbfan doesn't want to send his knives away to be sharpened, then Cutco's Double-D edge is a disadvantage. It depends on the user's preferences.
Tiger, it sounds like you are a dealer. I once almost became a dealer. When I found out the pricces of the knives, I backed out of becomming a Cutco knife dealer. A year or so later I became a knife knut and learned that the prices weren't all that expensive, as people pay LOTS for knives! But I alse realized that they are, in my opinion, overpriced given the materials and such. As Wolfman pointed out, there is a lot of marking up that goes along the way.
I am not saying that the knives don't work. No, they do cut and the double d edge works. However, you can't sharpen them at home. And a plain edge sharpened properly will work just fine in the kitchen. I also wouldn't like to get a Cutco blade without knowing the materials it is made from. Tiger, there is a difference between kitchen blades made of 01, 440-A and 420J2SS. What are the Cutcos made of? What are their Rockwell numbers? THis kind of information is important to me. And if it is important to say colobbfan, then a Cutco dealer's inability to tell colobbfan is another disadvantage of the whole Cutco Sales pitch.
Please don't take this as a personal attack. I am glad you have come to the forums, because the more people that come here, the more I learn.