Loving my new Focus. Had a chance to go from my old iPhone to iP4 as my contract was up but am giving this a try (have 30 days). Also was >< close to buying an Android Captivate.
so far... buttery smooth interface and integration. Very detailed user friendly -have it when you want it- not in your way when you don't- interface.
Syncing my desktop (synced to Windows Live) calendars, email accounts and contacts nearly instantly over air. Lovely. Syncing my documents (or pics) to skyDrive, allows instant pic uploads to Facebook or Live. Zune also allows wireless syncing after 10 minutes of charging in home over my WiFi so every night, every pic I took on phone is magically placed on my PC and vice versa.
the hubs (Music pictures, people) are done magnificently and already integrate with some 3rd party apps with regard to history and info being available when I want it. Excellent voice activated dialing, searching and commanding. I never use Bing on my home PC but this iteration is really cool and accessible and smart. The voice software understands amazingly well.
I can not express just how smoothly and richly inviting the interface feels and looks. The tiles could use a little more room for customization, but for a fist gen firmware...WOW. I am well aware of the shortcomings coming from daily work usage with the iPhone but I am certain it is only a matter of time those things will all be addressed. The already obvious subtle differences have me liking it better than just what was on the feature list which clearly told me to go iP4.
I also LOVE having a back button which in several situations operates much like multitasking.
The minimalist approach to the OS and display and the Focus itself is beautiful and screen is gorgeous. It feels like a new way of doing everything. Fast, concise, integrated, easy. I never had a ton of apps on iPhone so I'm not too concerned as to replacing the few I will miss over time. Also Xbox live is very nice addition,. Only big drawbacks so far are the marketplace search sucks as it does not categorize results and I wish the sleep/power button were elsewhere (on top maybe) or activated by holding the Start button for longer (which instead activates voice commands)
I'm sold and can't wait to see how they continue to improve the UI.