In the time since I picked up my XPS 15 9550 and TB15, Dell has introduced a new USB C docking station, the Dell Dock WD15 (450-AEUO). It appears that this dock has officially replaced the TB15. The product page for the TB15 is no longer available, searching for “TB15” brings up the wireless dock and the WD15, and on the XPS15 page the TP15 is listed as “Currently not available”. Additionally, from some quite harsh reviews, it appears Dell had some issues with reliability and drivers for the TB15.