What I'm going to say is not so much specific to DSN, but is generally true for all high end reps from all dealers (DSN, however, presents a bit of a special case given his mods and his prices). The answer to your question "Is it worth it?" really depends on you. I'll give you an example. As has been well-documented, I really loathe PAM Luminors. I find them ugly and clunky. As a result, I don't spend a lot of time examining or looking at them. So, for me, spending upwards of $400 for such a watch would be crazy. The reason being is that although DSN's PAMs are (from what I've been told) some of the best around, the subtle changes and minor fixes are not things that I would (a) notice; or (b) care about.
Now, contrast my feelings with someone like Hooligan or LoS (both of whom are huge PAM fans). I have heard them prattle on for literally hours about some minor 0.00001 mm variation with some crown guard. And for them, this minor flaw will ruin the watch for them.
So, again, it all depends on what you're looking for, and how much you care (and are knowledgable about) flaws. All reps, regardless of brand, price, quality, etc., are going to have flaws. Some are more noticable than others. With the DSN PAMs, yes, they are going to have flaws, but flaws that really only dedicated PAM fans are going to be able to spot. The question, therefore, is how much is a minor flaw going to bother you.
