As mentioned before, I have never played a Bechstein-D and never seen piano dealer put one up for sale, hence have no opinion on its performance or longer term financial value. (Though you can see the "list price" here:
https://www.bluebookofpianos.com/bechstein.htm , likely subject to substantial discount.)
If you have played one though and have seen the street prices, I would be interested to read whatever info and opinion you can share. Thanks.

General thoughts on Bechstein: If you are thinking of actually buying a new one, you need not worry about getting a bad Bechstein piano. I played quite a few smaller Bechsteins. In terms of the general capability to give you responsive touch and dynamic range, the Bechsteins do a very good job. Bechstein is no doubt a high-quality piano maker. Between Steinway and Bechstein, the decision is NOT about buying a good one versus buying a bad one, because they are both VERY GOOD -- the decision is about buying one that you
like the most, one that responds best to your artistic intentions and pianisitic instincts when you play (assuming you are looking to buy a musical instrument). There is simply no way to determine if a particular piano does that for you unless you play it.
p.s. If you are looking to buy a brand name or an investment instead of a musical instrument, though (and many people do that, there is nothing wrong with that) -- I would go with Steinway.