I was curious about the Heritage Special, at least partly because I liked the look. Considered buying a used pair, but I noticed what seemed like an unusually large number of pairs for sale, suggesting that people were trying and being disappointed. ... Was the Heritage Special a sonic “miss?”
Yes, it was a "miss", at least in my opinion.
Let me add the disclaimer that I have owned probably 5 pairs of Dynaudios and I hated every one of them (yes, I know, the definition of insanity), so I am definitely not a fan of the house sound. These included the Special 40, the Contour 1.3SE, the C1 and the Heritage Specials.
The Heritage Specials did have some good qualities.When adequately powered - at least 150 watts was preferable - they could go very loud without distortion. They imaged extremely well, to the far corners of the room.
But they were just strangely unmusical and unengaging. Whenever I played music on them I wanted to stop very quickly. Without knowing quite why, I came to avoid listening to the stereo. When I realised what was happening, I sold them and have ended up with some Rogers LS5/9s which I find much more enjoyable to listen to, even if they give up a bit of the hifi artifacts by comparison.
But this is of course a personal preference, and you may love them. So a lengthy audition is definitely recommended before buying.