Personally I don't think its worth the money, but I do admit I am a total tool minimalist. By that I mean I don't spend a lot of money on tooling. In my opinion, this is just a gimmick.
Hand cut dovetails do take time to learn, and I have a long way to go myself. But as crappy and as cheap as my dovetail saw is, it honestly wants to go where I put it. It tracks straight and true.
As a side note, I too do as Ken Close does, but I start with the pin board first. Either way the point is, you cut your first set of dovetail pins or tails as it does not matter, then trace your second set from that. In this way the first set really does not matter. If they are off, they are off, the tracing of the second set matches the first. Mathematically this means you only have to be accurate on the last 50% of the project.
I think far to many people get wrapped up in the "oh my goodness, I am making dovetails, I better get this right" mentality and get all nerved up. Just take a deep breath, relax and enjoy the cutting hand cut dovetails. That is the way it is supposed to be.