The brightness was a little inconsistent, fluctuating between too bright or too dark. The backlit keyboard was also confused: Trying to reduce its brightness didn't work at all until the next-to-lowest setting, which then plunged the keyboard into near-darkness.
Such inconsistencies are to be expected with a pre-release operating system, however. If you run into trouble or want to check system requirements further, both Microsoft and Apple offer a support page. And if you want to return to Apple's warm embrace, just hold down the Option key during a reboot and select OS X as your chosen OS.
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