A few comments on this device since I own one for 4 days now (Win10 firmware).

In general
The metal build of the device feels great, and all in all externally it feels like great build quality.
The keyboard is fine, and I have no issues with keys sensibility; the layout is a bit strange and takes time to get used to; my main issues seem to be the split spacebar and differently sized/spaced keys, such as Caps-A, Fn-Ctrl, tab backspace and numbers.
The mouse knob is actually pretty good, no big issues with it myself; also, it has a touchscreen, which is also pretty useful; not missing a trackpad much; and I use a wireless mouse often anyway.
They only released the Windows 10 firmware (I think it's a Windows image with integrated drivers) for now; Ubuntu firmware to come soon.

Issues
It has a fair amount of hardware and software issues already identified by the b̶e̶t̶a̶ ̶t̶e̶s̶t̶e̶r̶s users:
1. battery partially or completely detached on some units (apparently due to shipping; still, pretty weak?)
2. hal sensor not properly attached on some units (devices not sleeping with lid closed) which can be "fixed" by shipping the device back under warranty or disabling the sensor and using the power button to put it to sleep
3. some audio drivers issue where the 3.5mm connected devices give a crackling sound; partially solved by manually updating the drivers
4. some video issue some people get; solved by autoupdating the drivers in Windows
5. the various ports of some/most USB C hubs cannot be used while charging (hubs with charge-in port; on mine, the usb key gets disconnected when charging)
6. some reports of overheating CPUs under heavy load, and thus underclocking

Screen and size
The 1920x1200 resolution is pretty unusable on a 7" screen for normal usage; I get headache trying to use Windows at 100% dimensions; at 175-200% scaling it's much better.
The screen is beautiful for movies/pictures, the device is fast enough for its intended use and I believe it's a great on-the-road computer that can fit in a pocket (well, depends on the pocket...) or man bag

Gaming
With a SNES emulator and a cheap ebay controller I had, I can foresee some nice gaming sessions while traveling; those old games look quite good on the 7" screen
Gothic III, Titan Quest and Hearthstone also run well on the Pocket
Some older games are afflicted by a split screen issue; the right ~half stays black, perhaps due to the portrait screen being software rotated in landscape mode.

There are a couple of helpful communities, one on facebook and one on reddit; probably more that I didn't find yet.

Despite the issues mentioned, I still think that it's a very nice device; not perfect, but I'll get a lot of use out of it when traveling.

Looking forward to see how Ubuntu runs on it.