Upgraded from my original Moto Droid to the Thunderbolt, partly out of disgust that Mot has delayed the Bionic's release for so long. I was shocked with how fast it was, shocked at how the HTC Sense was so responsive. I had previously avoided third party GUIs on phones since they always seemed to drag it down. There doesn't seem to be anything that drags this phone down, and I don't even have 4G here yet!!! Now, if only Netflix would get off their rear and give me an Android App.