I can probably speak first hand of CD:UK, as both a viewer, and a participant.
The new presenters (Mainly Myleene Klass) are much better than Cat was, in my opinion, as Myleene seems a lot more friendly than her. She's friendly to the audience in ad breaks, too.
The music guests, most weeks, are of a high quality, and perform really well.
My only criticism is not of the show itself, but of the crew. I understand that things need to be done quickly, but the audience is pushed around like cattle, and generally not treated with any respect at all. The floor manager is nice, though.
All over, I think it's a good show, and I can't see it being axed for a long time yet!