I've been using this docking station with my 6th gen X1 Carbon laptop for a few weeks now. Overall I'm very happy with how it works. I connected the following hardware to the dock: 3 1080p monitors (2 display ports, 1 HDMI), wired gigabit ethernet, USB keyboard, USB wireless mouse, speakers and a USB flash drive. Initially, I had a little trouble with the triple monitor settings. Sometimes screens connected via Displayport behaved strangely. I applied the firmware updates available on the support site and haven't had any issues since. I usually plug and unplug about twice a day and close the laptop lid before docking as my graphics card only supports 3 monitors, not 4.
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