Yeah I'm evaluating it right now.
So far so good but...
Cons:
1. Search results:
Only 4 results viewable at a time in a scrollable list. They're too large.
iOS Youtube presented them as a scrollable rows of 4*3=12 per page and a better size.
2. In full screen video mode:
Double-tab to zoom video does nothing compared to the iOs 5 version.
3. I've read other comments reporting cannot switch video resolution.
I haven't confirmed this yet.
4. I've read other comments reporting of adds being pre-pended to the start of videos.
The videos I've watched so far haven't shown this so I cannot confirm.
... et.al...
^_^
That's an informative and good review. At least though, There is a YouTube app available now for our members. Maybe in its next update it will improve on some of these things.