Compared to the MAXX, the battery life is lacking on the S3. But compared to every other LTE phone on Verizon right now, the S3 has the best battery life out there. And it won't be too far behind the RAZR HD either. Plus, the S3 has the added benefit of a removable battery. With an extended battery, or a quick switch to a second standard battery, you've got the MAXX and the HD beat.
I'm increasingly happy with the choice to go with the S3, especially as more news on the upcoming Motorola phones pops up.