I backed this project on Indiegogo, and the Windows 10 unit that I received does not implement sleep correctly, so the battery drains excessively while the unit is suspended with the lid closed. After about a day suspended, the battery is fully drained. This limits its usefulness as a mobile unit, as I have to power off the unit between uses. I emailed GPD support, but did not receive a response. They are a very small company.<p>Other than that, it's been a pretty nice device for development. One of the nice features is that it's so small, I don't have to stow it during airplane take-off and landing, and can continue programming throughout. The keyboard requires some getting used to, though.