Used Subarus in good condition are in short supply, as I found out when
I was in the market a year ago.  However, offers to buy yours may not be
worth it.  For one, they may not offer anything like the actual value of
the car -- *always* check prices in your area for similar vehicles
before bothering to respond to such an offer.  For two, why would you
sell a perfectly good car you like?

If you already wanted a newer model, and the trade-in offer on your car
is good and from a dealer that stocks the newer models you want, you
might be able to negotiate a good deal.  Otherwise, I suspect you'd be
better off ignoring offers like this if you own a used Subaru in good
condition.

Once a year I receive a letter from subaru (or a subaru dealer) saying they
would buy back my old subaru at such and such price, or a guaranteed trade
in value. Some letter said they desperately need a used car like mine.

Does it really work?