Even though being used to the old skin, it only took a few seconds for me to like the new UI.
However, in this latest update, I noticed it's no longer possible for me to "ragequit" a song quickly like I used to be able. Whenever failing or quitting a beatmap before, I'd be able to quickly press "Back to menu", and just as quickly navigate and press all neccessary menu buttons in order to quit in less than a second. I was able to press the buttons before then menu screen had faded in, but I can't do that anymore in the song select screen.
This may just seem like a trifle to you, but this has annoyed me immensly. (Also it's some degree of functionality sacrficed for a shinier interface)
Other than that, great update!