Need opinions on this Demon for $25k

Typical comments from people that haven't bought a car in the last 2 decades or more. $25k is in the ball park for that car. Could you argue about $5k? Absolutely. But I don't think you could reasonably argue about $10k, not if you actually look at what cars are selling for now.

First, I'm not sure that isn't factory undercoating. It looks similar to what's on my '71 GT.

The frame rails and trunk appear solid, as does everything else actually. Definitely some wear and tear, but none of those lower seams or butted joints appear to have any rust at all.

The bubbles in the door and quarter are extremely minor. They may just be paint prep issues, but even if they aren't if you're planning on parking that car indoors you wouldn't need to be concerned in the next decade or two. I had plenty more than that on my Duster when I bought it, have parked it outside for a decade including under a damn snow bank on a couple of occasions and I'm still not worried about mine.

The rocker appears to be more chips/paint prep to me, but it's a small picture

Real 340/4 speed Dusters and Demons have sold for over $100k at auction in the last few years. If it was a real numbers matching 340/4 speed car in that condition you'd be looking at $40k. $25k for a clone is not at all unreasonable anymore. And yes, 10-15 years ago those numbers would have been insane, but again, the market has DOUBLED or more in that time for A-bodies.

Whether or not you "buy or pass" on this car to me really depends on what you want. It's not perfect by any means, but it does appear to be solid. And if it's a good running car then it is in the ballpark for the price tag. I don't think it's a steal, but it's not a rip off either. If you're looking for a show winner then this isn't it, but you're not gonna get one of those for that kind of a price anymore either. If you want something to enjoy on the weekends and maybe work on improving a few things here and there, well, it doesn't look like a terrible car for that. If you want to buy it as an investment and try to make a ton of money on it, well, probably not the car you want.

With the standard caveat that all I've seen are the pretty little pictures that have been posted here and a pretty basic description.