Still very good. I constantly leave it at about the halfway mark in terms of brightness, which is perfect, without sacrificing too much battery life. Difficult to say as I haven't let it run down from full charge yet, but it still lasts weeks basically.
I'd say the upgrade to the Paperwhite is worth it, for the backlight and increased PPI, but not the premium they ask for the Voyage or Oasis.
Cool, did you order your direct from Amazon or got through a local retailer? My first one was direct but it might be easier to get local...