So.... Got my first Eris on 11/6. Had the standard issues with battery life, and issues with lag, Sense UI shutting down on it's own, and crashing. Got my second Eris on 12/9. Got the update Monday morning, 12/14. Since then, I have had a couple of strange issues, including when my chomps SMS decided to prevent my phone from receiving SMS's. Even when it was loaded, it would prevent the stock MMS app from getting messages. Also, I seem to still have issues with signal..... Got all of those minor niggles resolved, and I now have to say that my battery is performing as expected. I had some HEAVY use on Wednesday (4 - 5 hours of up time) and my phone was at 15% at 9pm - 14 hours after coming off the charger. Thursday and Friday had moderate use, including a couple of hours of Bluetooth on Thursday, and an hour of it on Friday. Both nights I'm still at 30% as of 8 PM. I have to say that I am pretty happy with the battery now.