I'm not impressed. It looks nice when you first start it up but I don't find it very functional.
I tried Bing search, "new demos", "demos", "new games" Nothing relevant came up. Today it's not working at all, it's just showing the busy icon and nothing comes up.
The UI feels very limited. Why are there only 2 rows, why not a grid of icons that expands downwards, like a folder with thumbnails that I can customize. Sorry, I'm not a fan of this limited metro UI design.
It takes way too many button presses to get to the list with new demos only to be greeted by 90% kinect only stuff, in the same long horizontal list.
Browsing content is almost as unwieldy as the psn store now. Although that at least has a grid for a quick overlook.
My other pet peeves also still haven't been improved. Only jpg image support, no gif or bmp or any other lossless formats. The picture viewer still doesn't zoom or even show full 1080p pictures correctly. My background picture is still white from half way down.
Video controls and formats have also not been improved. The Zune video marketplace still launches a separate app, I hoped that that would be integrated. And I don't know if this has anything to do with the update, but black levels from the zune video marketplace are screwed up making all the previews look washed out. It looks like it's reducing the hdmi reference levels twice, squeezing the color range to 32-215 instead of 16-240.