Sorry for the long response, but hopefully some can benefit from my experience. I am coming from a Blackberry Tour, which I pre-ordered back over 2 years ago when it first came out. My tour was my first smartphone coming from a flip phone that I only used for voice. Once on the BB, I only mainly used it to SMS and data. I then expanded my use to Camera/video, calendar for work (Lotus Notes believe it or not), google maps, google calendar, three email accounts (hotmail, gmail, verizon blackberry.net), weatherbug, memopad, sports scores, facebook, twitter, nfl redzone, bed side alarm clock in a dock, flashlight.
Aesthetics - Very nice phone to interact with. Like the smooth rubberized feel of the phone in the hand. Very light phone to hold. Fits in hand nicely. Sits nicely on table with the camera hump.
Screen - Large and very easy to read. Screen auto adjusts in sunlight, but you can still see the finger prints on the phone. Screen is so close to the edge and sensitive that I still catch myself accidentally selecting something i did not mean to.
Hardware- Very quick phone. When on wi-fi I prefer to use it over my Dell Inspiron 1000 laptop. Using the second core for more of the display rendering the only hiccups are only actually waiting for the data to download. I have had the screen lock up for about one minute and a reboot, but it was also attached to my laptop messing with an initial sync of the data SD cards to PC.
Phone - Both blue tooth and speaker phone work very good. Speaker seems to be plenty load. Wish the FM Radio app would play over the speaker as it needs headphone for antenna, but this is more an app issue. I have only used the actual phone over blue tooth so far.
Overall User Interface (including Motoblur) - I like the UI. Took some getting use to it coming from Blackberry Tour. To make a comparison of going from a MAC to a Window PC. So many ways to get to where you want that there are too many options. I just have to figure out my way.
Widgets - I am liking widgets very much. So far only loaded weatherbug temp and time one. Seems to update slow. The temp can be different between the weather-bug temp in my notification bar and the widget on my home screen. I know a little over kill, but I am a server weather spotter in my free time. So it is important to me.
Signal quality - Same as my BB tour. I download the app to find signal strength of the cell phone tower along with there location. I drove around a bit and it went from tower to tower very good. Although in my area it is a very strong 3G area.
GPS - No problems and very quick in finding and tracking my location. Used the nav app from Best Buy to my home on a very stormy night and it tracked me withing single digit meters all the way. My Tour has a tendency to not get a lock during storms. But once again I can usually pick up double digit GPS satellites in my area, although I have not downloaded that app yet on the driod x2.
Social Networking - Like the social media stream having facebook and twitter in one spot, but also can just go look at them individually. Only had one problem of a link within a link one a facebook posting.
Email/Calendar- I have already converted all my main email to gmail and google calendar. I have an app that takes my Lotus Notes calendar at work and put it on my google calendar. I have not tried to get my hotmail calendar synced up yet, but that would be just a nice to have any email calendar on one droid calendar. Added all my email accounts (gmail, hotmail, yahoo) with no problems. My blackberry email got shut down on the conversion. One thing that is different, is that I could take one of my emails and light up the LED when a new message came in on my Tour. Have not figured that one out yet. Anyone know how?
Battery Life - Battery life so far is much shorter that my BB tour. I have been trying to push the droid to it's limit to begin with (GPS, 3G, WiFi, Bluetooth, 10 min screen timeout, constant use) and I have not been able to last longer than 6 hours. But once I get into my normal routine again, will post an update if it will last me all day. But I don't expect it to match up with a BB tour.
Performance - Faster than I expected. Put this on WiFi and it goes instantly on any app. 3G the app comes up the same, but the data is a tad slower. Web pages are very quick to load also.
Media - Transferred my 16G SD with all my music, photos, vids from BB tour to Droid without problems. Streaming NFL Live video looks good and will look better once hook it up HDMI to the big screen. Did i say NFL red zone channel this fall will be great, if we have nfl. Did music on headphones and speaker good. Did FM radio on headphones while mowing the lawn and could hear it just fine.
Keyboard's - onscreen keyboard is taking some getting use to. Can only seem to type in landscape mode (in which a 4.3 screen pays off), but I like the word suggestions as you type. I do find myself missing a track ball mouse when trying to go back in a sentence to correct words. But I will adapt.
Camera - The camera is one of the best I have had. The continuous focus really pays off when trying to snap those action shots. It is very quick to snap the shot and be ready to take another one. I have not tried the video yet, but expect the same. Indoor zooms seemed to get a little grainy, but outdoors picture zooms were great. Wish it had more zoom on it, then I could truly replace my stand alone camera.
How the Droid X2 compares to your previous smartphone - Enough said on that above.
Disappointments - Verizon not selling this until Thursday in the stores, but could order online for delivery. Had to go to best buy to get immediately. Wish apps would completely close when exiting. Wish there was another way to go back other than the physical button. Physical buttons have a slight clicking sound and that is one of the reasons I did not buy a BB storm. Will see if it is noticeable in work meetings next week. Miss a physical camera button or a configurable physical button. Miss going to phone sleep putting in a holster, although I do like the droid x2 face in open holster. Miss changing the vibrate/ring when holstering.
Any questions let me know. I am still waiting for my car dock, home dock, HDMI cable to be delivered.
Mike out.