Wobble does not bother me at all. I have the Book on a cushioned ottoman right now. The screen touch is so responsive and the keyboard attachment to the screen is so solid, that I wouldn't even call it wobble. No problems.
My 512 machine has 1TB, because I have a 512 GB SD card in the full-size slot. I copied my OneDrive files to it, then to the Surface Book drive to speed the transfer of machines.
Note: My 66GB of OneDrive data took 19 minutes to write to the SD card from the SP3, and 11 minutes to copy to the Surface Book from the SD card. Good performance.