This short story, to me, is Gibson at his absolute best, which. It has all the earmarks of a classic cyberpunk story. And I mean the real earmarks, not just people in full leather and reflective sunglasses. It explores that wonderful play between urban decay and extreme technological advance, slammed violently together and wrapped in a prose so vibrant that you can almost see the sheen off of a piece of computer equipment, or feel the grime built up on an old table.
"The Winter Market," more importantly, explores the human condition and what it is like to be human. Like much of Gibson's early work, it asks whether something that seems in every way to be human IS human, or if there is some quality to humanity that simply can't be replicated. It also, at it's core, touches on the idea that people are flawed, and that, no matter how hard we try, nothing we do is purely selfless.
If you've read Gibson's work before, you probably know what I mean. If you've never read Gibson before, then what are you doing here? Go out and find some Gibson to read on you own! You'll thank me for it.