We like it because:
1. I'm a news junkie and spend a lot of time surfing.
2. Service is usually very slow, and I hate to watch the arrow circling around, knowing that the meter is running.
3. I use my tablet before going to bed, and sometimes forget to log out, but that's not a problem if you have unlimited wifi.
4. Bonus points: After the first day, the upcharge usually drops about $10-20. After the second day, they'll tell you the offer is no longer available. Plan accordingly.