Got the update ...
... and am singularly unimpressed with it.
The UI is as useless as is was before, except the Games Marketplace is now a complete mess and it's even HARDER to find what you want there before (they've cleverly hidden the XBLA games another menu deeper, they used to have their own category before)
The new color scheme hurts my eyes - and premium themes are as bad a deal as they were, with big flaps of UI covering them for the most past.
Shame.