How were you able to return your Surface Book? Were you within the first 30 days?
I initiated the online return process on the last day of the 30 days window (Dec 24th). I got the shipping labels at that time. I already had a few problems (mDP to DVI not working on dock, Scaling issue after sleep, Connected Standby not working) so I had a feeling I would return it, something was not quite right, especially for the price paid...
I then contacted the hardware manufacturer of my ICYRaid device and contacted MS Support. When it was clear that the SB was causing the issue and that MS Support could not help me (they were trying but had no solutions) I returned it. I dropped it at the local UPS Store on Jan 8th, they got it the next Monday, Jan 11th. My refund was processed in a couple of days and was refunded the total amount (almost $4500 CAD) on Jan 14th.