It's hard (or nearly impossible) to feel nostalgic about anything you didn't directly experience - and that means the thousands of clone PCs being made back then. And because they were establishing standards like ISA and VGA and SOUNDBLASTER, well, that made them even more alike than not. So no differentiating qualities there.
Nearly everyone I spoke with considers their first PC highly nostalgic. But that is one single specific individual PC.
My Gateway 486 isn't a nostalgic platform that much to me. And there isn't anything about mail order to get excited over either. It's. Just. Mail. Order.
But I found great interest and had tons of good times learning about the various various subsystems are, as I was into learning about the emerging technologies and how ,uch more sophisticated and capable they were compared to the 8-bit and 16-bit machines I was using previously.
It was (is) highly nostalgic to flip through my catalogs and sales materials and the brochures I collected from the then supermarket-like computer stores. BITD we tended to shy away from advertisements. Today they are great fun to read and re-read!