I have purchase one unit and experiencing random freezes.  not blue screen,  need to hold the power button to restart,  this is happening randomly and appears to be under load, at least for me,  I have two more of these PCs on the way so will see if they all have the same issue.08-04-16 UpdateHave patience, you will need to wait for a display driver update,  update 07-20 but still does not completely fix the display driver issue.This is a know issue,  see Intel Support forums