I think the neat thing about this is the big suite of sensors that are probably very easy to integrate. But if this thing is JavaScript only that is just silly. If it's capable of running a JS interpreter, it should be able to run Python and Ruby. Of course running compiled binaries should always be an option. The device is too expensive, I think. Raspberry Pi and other mini ARM Linux machines can be had for much less (~$35) and offer much greater flexibility. I'm not even a hardware person (at all), and yet this is way too much abstraction.
If you don't want to wait you can look at getting into Arduino. A friend of mine used it to make a "bomb" for their airsoft games. Arduino + nokia 3310 lcd display + motorcycle battery + satchel + siren he liberated from a broken house alarm = one kick ass bomb. It makes a helluvah noise with custom fuse lengths, retry lock outs, etc.