I just traded my TBolt in a couple days ago for the Moto RAZR HD and wow, it's like night and day. Day being the TBolt: plain, dull, quick don't get me wrong, but the RAZR HD is where the night life's at. Literally I can go out at night without being paranoid about the battery being dead half way through (that's with the extended 2750mAh battery that made me embarrassed to be seen with it).
For some background info, I've been through the original Moto Droid 1/Milestone, iPhone 3G, HTC Thunderbolt, and now Motorola Droid RAZR HD.
I decided to go back to Motorola because I loved the build quality of the first Droid. I liked HTCs phone too, until I began running into features that didn't necessarily work, such as the "flip to speaker". No matter how many times I tried that feature never worked. I also got very tired of the Sense skin. It seemed too bubbly to me, too cartoonish. When I heard from AndroidCentrals own review of the DNA where things like decent battery life and "certain features that just don't work" I just had horrible recollections of the Thunderbolt. I have to admit, I love that HTC is always trying to innovate and be trailblazers in mobile hardware and features, but when things don't work, and a lack of patches to fix them aren't ota, my loyalty to them diminished.
Some big differences between the RAZR HD and Thunderbolt, build quality. The Thunderbolt was thick even at the time it was released (my Droid 1 was thinner); the RAZR HD is slim and has a smaller battery than the extended battery of the Thunderbolt but lasts much longer. The kevlar backing is a nice original way to stand out of the crowd of glass plates and plastic covers. I also personally prefer the RAZRs industrial design; it feels modern. My most favorite detail is the LED notification light. I have the White RAZR HD, and when I get a notification, it blinks a green light that makes the white off the phone shimmer green. Its a nice effect. To those that hate the notification light can always disable it or just turn the phone screen face down.
The camera, although reviewers have stated the Moto line of phones have weak cameras, its a definite step up from the Thunderbolt where now I can actually burst shots rather than having to sit there for 4 or 5 seconds before i can take another photo.
Screen resolution is obviously a great step forward. 720p videos look very nice. It is a smaller screen so some images look much nicer vs. my 1080p computer monitor. Pixels are closer together so the picture looks much more crisp.
Speaker quality is so-so. Sometimes I have a hard time hearing the other person on the other line, even with the voice privacy option off.
I love the Custom Moto skin. It feels like this should have been the Nexus 4, with its unaltered Jelly Bean OS. There are some small tweaks Moto had their hands on, but overall it feels like stock Jelly Bean vs. something like the Nexus 7.
One thing I miss from my Thunderbolt is the extra Menu button. Since Android apps don't really have to follow a strict menu layout, it feels like a memorization game with each app, where I have to remember where the menu button is (if the app even features one). Androids getting better in this department, but its not quiet fully there yet. Also the built in kick stand. I have a case for the RAZR HD that has a kick stand built in, but if I want it all the time I'll have to keep these case.
Overall I'm very happy with my choice. If I'd have to choose between sticking with Motorola or going back to HTC for my NEXT phone (in 2 years), I think I'm going to stick with Motorola. Unless Nokia will join the Android family... then I'd have to reconsider.