I'm still on the fence.
For the Thunderbolt, the reported reboot issues are a deal-breaker for me -- reliability is my number one consideration. The reported battery life is also major concern, though I'm willing to buy an extended battery if that will let me regularly at least 18 hours on 1 charge with 6-8 hours of local music playing and 1-3 hours of LTE web browsing. I'm willing to install an AOSP-based ROM (CyanogenMod 7, which I use on my Droid, would be my preference, but it isn't even at alpha yet) if that solves problems that the stock ROM has without losing key capabilities.
For the Charge, I'm a little worried about it only having 512MB RAM (vs. 768 for the Thunderbolt and 256 for the Droid I have now). I'm also a bit worried about reported lag with the stock ROM, but I'm willing to try the Voodoo lagfix that reportedly addresses that, plus I'd probably use ADW launcher (like I do now) in place of the stock launcher. The Super Amoled screen is a plus,and reports that it is much easier to read in bright sunlight than the Thunderbolt's screen is also a plus.