Well I bought the Elite X3 yesterday.
It is a beast of a phone. The display is stunning, crisp and bright, it fits in the hand very nicely, and it's lightning fast. The B&O front facing stereo speakers are awesome.
I have not switched over to T-Mobile yet. I'm wifi only, and I'm going to see if I can get T-Mobile SIM from work tomorrow to try out. As soon as I powered it on, and set it up, the phone immediately downloaded a couple updates, and then upon restarting I was set to get 1703 and the new HP firmware update. I don't mind the tile interface and the Bing apps are surprisingly nice. Bing Maps is excellent, and Bing Weather is probably one of the best weather apps I've ever seen. The rest, eh not so much. Just because the same app is available on Android and Windows Mobile doesn't mean the quality is the same. The Amazon app, the NASCAR app and Fox News all pale in comparison to their Android counterparts. The Bank of America apps is nearly identical, but lacks fingerprint authentication to sign in. Otherwise it's perfect.
While I'm not much of a fan of constant notifications, working for a European based company, and having many of my co-workers travel back and forth on a regular basis, having the breaking news alerts from Sky was pretty nice. Also, I've become heavily dependent on the Google Translate app at times to translate various European languages into English using the real time translation with the camera, I will see if any of the translation apps are similar tomorrow. And so far, I am unable to connect to my work VPN. The SonicWall app beyond a disappointment, it just takes you to the VPN section of the system settings, and no matter how I set it up, it always comes back with a different error. I will contact SonicWall about this tomorrow. Their tech support has gotten much better since Dell dumped them off to be their own company again.
I have not played with the Dock or Continuum yet.