I've had my DX for a week now(my first smartphone) and used it alot the first few days, with some problems, but that was me not knowing things about apps and setup of the phone itself. I love the phone. I thought it was too big when I was looking into getting an upgrade and was deciding between the X and the Fascinate. At first leaning towards the fascinate. I kept reading the forums here on AC and decided after awhile that all the workarounds on the Fascinate to get stuff that the X had already, was not worth it. I'm refering to the Bing, bad GPS, and not as good reception/call quality. All the things I read the X had better reviews with. I'm very happy with my decision.
Mine came already loaded with 2.2 , but I started getting the newest update messages the 2nd day I got it. The 2.3.340 update. I just keep hitting to Update later, because I keep reading about all the issues people are having with the new update. Mine is running smoothly at the moment, so don't want to take a chance of anything happening yet. I'm liking the Moto blur widgets at the moment, so not going to try launcher pro yet. I've only downloaded about 7 or 8 apps, not really sure which ones to get yet.
Battery life the first couple of days when I used it the most, was Excellent. The second day I used it about 16 hours of moderate use and got down to 15%. That was from 8am to midnight. I'm not a power user by any stretch, but I think I'm getting good battery life so far.
GPS and Phone quality has been great. I came from using VZ navigator which I had to pay for and now using Google maps for free. I did like VZ navigator a little better, but just a preference and not about to pay to have it. No problems with Google Navigation getting me where I want to go. I even bought the car mount and like how it works with the X. Bought a bluetooth bundle with Car charger, screen protectors, and a nice two piece case the VZ rep who had it for his Fascinate had recommended to me. The bluetooth works well.
I use Wifi at home and on the road only had some problems with 3g coverage on the road once. Once on a long phone call at home, the X did feel a little heavy in my hand after awhile, but not bad. I can always use the speaker to talk if a problem or the bluetooth. The phone runs very smooth. At first I couldn't wait to use the swype, but couldn't get use to it for a couple days so used the multitouch keyboard. After seeing a VZ guy using his thumb to do it, I tried and found it to be great (I was using my index finger on the landscape mode). I'm not a texter and don't have texting on my phone, but I do use the email and am getting much better with the Swype. Voice to text is good also. Although when using google Voice on the web, sometimes can have problems understanding me.
Overall very happy with my choice and still have 3 weeks left on my 30 days, so if something goes wrong, I can return it. I'm probably going to stick with it if something does go wrong and just return for another X. I appreciate all the help from the forum and the forum for all the research I did before getting my X.

I'd definitely recommend this phone to others.