Hmmm... Yeah, this is interesting. Surprised at such vastly conflicting anecdotes though.
I've been trying to decide whether to go with the Motorola X or the HTC Thunderbolt. I liked some things about both. The TB seemed to have a lot of technical advantages, including camera, processing and download speed {no 4G here so that's not a big issue yet}. But then I liked the HDMI access on the X and also the physical buttons made it much less likely to bump them accidentally when holding it, unlike the TB. I can tell that's going to be a problem. Perhaps a case will make a difference though...
Two things have concerned me the most about the TB, outside of some extra cost,
1) a technical review I read which mentioned the TB not taking good pictures in lower-light settings as compared to some other phones,
2) the speakers did not seem to be nearly as loud when I compared them.
I think I can live with the camera lighting issue. The sound, not so much. If it does provide less media volume than the X, and it's a problem a patch can't fix, then I'd say that's a deal breaker for me.