I also am completely satisfied with the Thunderbolt so far. Coming from a D1 that was running 1ghz, there's no comparison. The Tbolt is leaps and bounds faster and much smoother. On my D1 I had Launcher Pro and loved how it smoothed the experience out, but Sense on the Tbolt is proving to be much better.
The lack of a physical keyboard, one of the things I was concerned about, has not been a problem at all. The only application that I miss using a physical keyboard with is PhoneMyPC. It adds a few extra clicks to the process, but nothing I can't deal with.
My only real gripe comes with the Notification LED. On the Droid, I could spot the led from across the room at almost any angle. Also I could set the LED color for each notification type, which so far it is appearing that we have green, green and green as our LED colors.
The battery hasn't been an issue (I'm in a 3g only area).... I've had it off the charger now for 8 hours and am at 70% and have had to show it off to everyone in the office. So it's been browsing the web, few sessions of angry birds rio and many texts and emails. I also have to mention that my old Droid would be at 70% at this point as well... so I'm not seeing the battery issues that some are.
I like the build quality, even the heft that others haven't liked. To me, a good solid phone is better than carrying a light piece of plastic around that flexes and creaks. The 3g speed has been better than my D1 and Voice and Data at the same time is an added bonus! Two Thumbs up!