I guess my own question would be, wouldn't Solu make more sense as a pure cloud service, rather than a sort of combo portable computer / cloud service? Rather than forcing the user to plug a monitor and keyboard into and out of the device each time they move to or away from their desk, they could simply log into Solu using their existing computer. Or use their existing mobile device to log into Solu, while they are on the move.

If you prefer to have each user have a personal hardware device (say, for security reasons and/or to maintain local data), a USB dongle would seem to make more sense. The user could simply plug a Solu dongle into their desktop computer to log in, or into their mobile device (as USB-OTG is becoming fairly standard on most mobile devices today).

It just seems kind of odd to center Solu around an independent mobile device, when it appears that a significant portion of its use will be while plugged into desktop peripherals. Why not take advantage of the most common desktop peripheral available today, the PC itself?