So far it is a fairly big step up in most performance categories except battery. If you are used to the DX, it will be a pleasant upgrade. I wouldn't expect a DX user to whine about how big it is (insert "that's what she said" here). Reception is typical Moto awesome, camera is similar quality but MUCH faster, and browsing on 4G is all that. The included apps seem pretty cool, but again may be useless if the battery life is as lame as it has been.
An idea on battery. Took it off the charger, had smart actions keeping a lot of stuff off. Watched a 22 minute video, did some email and browsing (maybe 30-45 minutes max), listened to tunes for about an hour, and dropped to 30% after 6.5 hours. I think the DX would have been a little better, especially since I wouldn't be turning data off like the Razr does.