reven: I didnt really like it at first on my nexus5, but now I have warmed to it. I did prefer the darker keyboard however (found it easier to read) and i prefered the transparent "apps" button on the homescreen (so i could see more of my background :)). but notifications etc are a lot better.
There are keyboard themes now and a dark one is available. settings/keyboard/keyboard options/appearance and layout/holoblue.
you're welcome :D