If it doesn't pass function checks, you need to find out what it would cost to make it work, and it might be easier to just pass it up, which IMO you would be entitled to. However, if it works correctly with whichever springs it ends up with, it looks to me like it is well worth the money. It cannot be a collector with the finish, but it is probably actually a superior finish. I wouldn't mind having it with that finish, particularly as a shooter. Others are entitled to be purists on that issue - just telling you that I am not.
Not sure where you would find one of those for less than $400, but maybe there are those who do know. I haven't done that much buying lately.
BTW, I'd check that gun out with the as-modified springs before rejecting them. IMO and experience, NOBODY makes the DA too light for combat use, as long as the gun still passes all function tests. You are entitled, of course, to your own opinion on SA, and I agree that there can be SA pulls that are marginal to unacceptable for defensive use. However, I have only one carry gun that has such a pull, and I don't care, because I am simply not in the practice of cocking those things. I really consider ALL SA revolvers dangerous for defensive use (in my hands), and have for many decades accustomed myself to shooting adequately in DA mode. I used to make my S&Ws DAO, but I don't even bother anymore.
Anyway, if you like the gun and it works right, I think $400 is just fine. How much do you think it would cost to Cerakote a 28 if you wanted it done (and I think that that is an OK idea)?