My girlfriend got the TB on launch day, this is what I have observed so far:
pros:
-4G is obviously blazing fast
-New version of HTC sense is flawless
-fast boot (not supported by all apps)
-solid phone, you won't smash this one
-gorilla glass screen (unlike the dinc)
-Large size makes for a pleasant user experience
-same snappy processor we are used to with the dinc and evo
Cons:
-HORRENDOUS battery life. Despite what others may tell you about it, if you are a moderate to heavy user, the battery life is absolutely terrible. She is lucky to get 4-5 hours out of it. This can somewhat be circumvented by shutting the mobile data (LTE/EVDO) off using a widget. Don't plan to play games and be on Facebook all day with this one, it simply won't happen. Also it is impossible to switch 3G or 4G off seperately so your phone will drain your battery switching between the two constantly.
-On her phone it has the same slow GPS issue as the Fascinate does now.
-Phone runs HOT. As hot as my OG droid does running a 1.1 ghz kernel.
-The phone is technically already outdated tech. Its a rebranded EVO, which has already been out for close to a year now. Newer phones will be out VERY soon if you can just hold out a bit longer.
My personal opinion? Its not for me. I need a phone that will at least last me a shift at work or a day of classes, and this phone absolutely will not unless you barely use it. It certainly isn't worth getting a phone that is so multimedia capable but can't truly harness this due to extremely poor battery life.