I got my first U1 coming. $35. It's a mk1 Came with both batteries, but no SSD or caddy. Scored an 80gb MSATA for $18. Got a WWAN board for another $10. Plan on adding a M-PCIE to SD adapter on it. According to model number it already has GPS in it. Not sure if I will go with Win7 or Linux. I am building it for use as a DSLR camera remote control. Going to use liveview for previewing shots. U1 tethered via usb cable. Nikon has the Camera Control Pro 2 software which seems nice enough. I would get total control of the camera on the U1. I stumbled across a Linux program called Darktable which might do what I need. Linux would run very nice on this U1.