thanks - we've been debating flipping it back to black for the same reason. Probably will!
Just updated - love the slider. 3800k turns out to be the perfect temperature for the room I'm in, so right in-between the old presets for tungsten and fluorescent.
Having the ability to fine tune it like this is really nice.
In addition to restoring a monochrome option, you should also allow users to turn off the menubar icon entirely, and simply rely on the System Preference pane for access on the (very rare) occasions when it's needed.
Thanks for your consideration.