This short story isn't about a vampire rock band, and we can all be thankful for that. It is, in fact, a particularly disturbing take on the dangers of nanotechnology. It's a cautionary tale not uncommon to Science Fiction, although a particularly well thought out one, in my opinion. It also takes a very original take on what could happen to humanity if technology runs out of control.
The one flaw I see in the story is that it does sometimes get lost in technobabble while explaining the microscopic organisms of the tale (Bear doesn't ever actually use the terms "nanites" or "nanotechnology"), but this only detracts very slightly from what is an excellent cautionary tale. , Of course, that's really just a matter of personal taste. I could easily see someone that's interested in computers or biochemistry being really interested in this aspect of the story.
However, even if you're not particularly scientifically inclined, this is a pretty damn good story.