This review seems like a spoiler, but it really gives nothing away, at all...
This book really got me worried about how horrible human beings are and what we're going to do to the world... It gave me a very depressing feeling while and after reading. It is set in the (near??) future, and most people are basically controlled by their "feeds" implanted directly in their brains, which are used mostly as an excuse to constantly show them thousands of advertisements. I guess the ending is supposed to be a little hopeful, in that the main character is considering fighting the feed, when he sees its awful power over humanity, but... I think hopeful is not a word that anyone can truthfully apply to this book.
The writing style was very distracting at first, because it is VERY informal. I will explain with a quote: "I was like trying to sleep for the last few minutes of the flight, because... when we're goin hard i get real sleepy real easy, and I didn't want to be null for the unettes on the moon, at the hotel, if any of them were youch."
SO: Interesting. Very cool. Spooky. Makes you think. But definitely not cheerful. At all.