I turn on LTE when streaming Google Music, Pandora, or Slacker, for a few hours a day. Other than that I use WiFi at home and 3G at work. I also play games like Tiny Tower when I get a break, which tend to burn through battery. Also some texting, surfing, email, Twitter, and reading with Kindle or Aldiko. With the standard battery I was getting 8-10 hours, 12 if I never turned on LTE. So for me the extended slim battery is worth it for the additional few hours. Others have different needs though, as your post demonstrates. That's why it's great that the Bionic has so many customization options, IMO.