$600.00 is a pile of money for a pistol of any kind. The S&W DAO pistols are not popular in my area and do not sell fast or bring big money. It took me a good while to sell my 5946 a few years ago. I still have a re-imported 3953, that I truly feel is the best CCW ever made (wish it had a repeat trigger pull). My gun might bring $300.00 if I had to sell it, and it would not sell fast.
There has been a 3953 for sale on a local forum for a few months, with no takers. Consider the lack of parts and no factory support too.
Then go buy it if you must have it.
Here is mine.