Pros:
Screen - Coming from the old BB Storm, this screen is amazing! ...not just in size but quality as well.
Swype - Best new way to type, period.
Camera - even though it's not a DSLR, it's still faster then my Storm so I can appreciate it. Video is awesome too!
Apps - I'm amazed at all the available apps I can download. That alone will keep me busy for a while.
Build Quality - One big sigh of relief was that I didn't need to go back in to exchange my phone the very next day like I had to with my Storm.
Cons: I'm a complete newb to the Android world so if I'm missing something here, please let me know...
Memory Card - I wish they designed it so that I can take it out and put it in without having to pull my battery each time. I'd like to leave my phone on to receive calls and texts while I upload songs or movies. The Storm had this capability so I don't see why they didn't do something similar here.
"Unlock" slide - Its a bit choppy. I'm sure it's gonna get fixed but it seems pretty basic that it should be great from the get-go.
Browser's Double-Tap Zoom - I love the multi-touch feature on this phone for zooming in and out of the web. However, I wish the double-tap part worked a little better. When I double-tap on text on this forum for example, it doesn't center it. I have to double-tap and then slide the text so that I can view it all. Seems like it should just auto-center the text section since that's what I'm trying to read.
YouTube - I'm still trying to get an answer to this one since I'm not noticing anyone else with this problem but I cannot get my YouTube videos to play properly. On WiFi, it plays about 75% of the videos and then stops (it just sits there with a black screen, no buffering, nothing). On 3G, it plays with the video and audio at different rates so it ends up looking like a dubbed Jackie Chan movie... really annoying. I'm not sure if it will finish the video or not as I usually stop it just seconds into the video since it's impossible to watch with the mismatch. Even though the quality wasn't as good on my Storm, it never had issues like this before.
Facebook App - Not as user friendly as compared to the BB version. I wish it would load right up to the latest posts instead of requiring me to "choose" that I want to see that each time vs. Messaging or my Profile, etc. I've given up on the app completely and use the web-based "touch" version which I like a LOT better. I'm not quite sure why there's even an app for phones like the Droid that do very well on the web.
and finally, last but not least...
Messages - I loved how my BB put all of my messages together under one icon/folder/app/mailbox (or whatever you want to call it). I go to one place to view SMS, MMS, emails, Google Talk, etc. Maybe I'm missing something here but I haven't figured out how to do it on the Dx yet. Kinda frustrating that I have to have multiple icons on my desktop for every single communications form that I have.