Actually,
I have no real issues with the battery (it is like the fuel tank on my motorcycle, I always would like more, but even with a larger one, I will occasionally let it run dry.)
BUT, as much as I like my Thunderbolt, you must admit, HTC did deliver a couple of seriously flawed software updates. Most notably the one that causes some phones to reboot constantly. I saw it, but it was minor for me. If I had the constant reboot back then, I still would have a mistrust of the Thunderbolt, and maybe HTC in general.