Someone at the XDA forums said this:
yesterday was the first full day i had with it, and i took it off the charger around 11am and when i got back at 330am, it still had about 30% left.
and it was a moderate to high moderate day of usage for me (listened to podcasts in the car for about 2 hours total, music at work for about 2 hours, updated posts, read facebook/twitter/websites, played some games.
i also have okay to poor reception at work, so that probably didn't help battery issues when i moved into areas with poor reception.
so in conclusion, i'm quite happy with how well it's holding up so far, as good as the original focus i had, if not even better.