Lots of folks here have D-25s... they are kind of a "cult" guitar. Mine is from '74. The laminated mahogany arched back gives it a very unique sound, characterized by a deep, growling bass and incredible sustain and projection.
What're they asking for it? IMO, anything less than ~$600 is a good deal, and less than ~$500 is a steal, if it is in good shape (decent action w saddle left, no cracks, reasonable cosmetics).