So far, I have gone two days with the 2430. It has held up pretty well.
To those who are disappointed with their extended 1900, remember to kill it first, then plug it in so that the lights flash, and charge for 8-10 hours. That will give you a real full charge.
The 2430 gave me over 20 hours the first day with light 4G connectivity, mostly wifi, and no video or games. Today, I've gotten about 16 hours with 4G Tethering for about an hour. I will try duplucating my 20 hour run, before I begin running video playback times on the stock, 1900 and 2430.