i recently purchased a ud 3900 and fixed it up with my surface pro 2017.
there are some problems.
there is some lag with my mouse. i am using a microsoft sculpt comfort mouse on a bluetooth connection.
there is lag on secondary display when i am working on excel. the lag is a serious problem as i cannot work as efficiently as i would like with the lag. this lag only happens on secondary display, not when it is on my surface pro display.
failure to connect to network drives when plugged into LAN. once the network cable is disconnected and pc is connected to network on wifi, it works again.