This is great! I don't know how much of it is open in the -all specs open- sense, but being able to install usual OSes on it, paired with the really nice price, makes the platform interesting for a lot more uses other than gaming.
In fact, I don't see it as a simple gaming platform but also a portable terminal with lots of buttons.
Hopefully more competition in this field will also help bring down prices of other interesting gear such as the GPD handhelds and mini-PCs, the One Xplayer etc.