I'm really happy that Amazon is allowed to stream the show days after it's broadcasted on TV. That's far better then Hulu Plus (with their ads) and Netflix (takes too long months and years after the initial TV broadcast before getting the right to stream).
I read the book and so far, I like how some of the really annoying characters in the book aren't so annoying (so far) in the TV show.
Now that it's guaranteed a second season, I hope they don't drag the series for any longer then a second or third season considering the book was long, it wasn't THAT long. So far, I like the pace. They're not stretching things out toooooo long so they can make this a 8 or 9 season show.
If they plan on going longer then three or four seasons then they're veering far away from the book.