Had this screen for several weeks now and just wanted to give my two cents..
First of all cables - the short ones work - club 3d, belkin, aukey have been tested and do work.
But when and if you receive this monitor you probably need to connect with Hdmi or display port and through the menu on the monitor switch to USB-C as source..
Second if you have a macbook 2015 or 2016 you can install an overwrite which will give you the option to switch to 60hz while in 4k mode which in return downgrads usb 3.0 to usb 2.0 if you have any peripherals attached to the monitor.. here is an "how to" http://forums.macrumors.com/threads/4k-at-60hz-on-12-rmb-hack-monitors-cables-ad apters-that-work.1974167/#post-22932460
Third as reported the monitor flickers sometimes which is really annoying.. also there seems to be a slight hissing sound emerging form the monitor, this goes away when the monitor flickers (usually it goes dark for 1 or 2 seconds and comes back on)
There is no support from Lenovo and to go through the Lenovo you will need serial number and so on, which is also kind of annoying.. So there are no updates to the drivers unless you use windows. while this might be a with issue firmware there are no updates -- heres a link if they at some point decides to make one http://support.lenovo.com/dk/en/products/Monitors-and-projectors/LCD-Monitors/Th inkVision-X1?tabName=Downloads&linkTrack…
Do not buy this monitor for a macbook !! seriously DO NOT BUY IT..