I must say that I am enjoying my Windows Experience so far. There were a few times in the first week where I looked at my Android on my desk and thought about it, but after you start to get used to it , it is great. Few minor issues so far:
1) There is no quick scroll in the Apps menu. With android you can press along the edge of the screen and go straight to that letter.
2) Whatsapp Push Notification Error. I don't know if that is the phone (Samsung Ativ S) or crappy CellC though.
3) You never really know which apps are going to rotate when you flip to landscape, but I'm sure this will improve with time.
4) Has anyone found a Tube Dwnloadr that actually downloads for free?
The Sync thing will take a bit of getting used to, but once gmail, facebook etc is set up, the Windows UI provides quite a holistic solution, especially the "People" Tile which syncs with your FB contact pictures. My only concern is how much data this will consume in a month.
Some really great apps so far. 9gag, MangaCamera, MemeLens, Imagefusion spring to mind.