My first one was ok until the Windows 10 update was run (it seemed like a big one, probably included the fall 2017 creators monster update).  Near the end of the update, the monitor went black and displayed "Mode not Supported".  After trying various fixes, I returned it.  The replacement took 9.5 hours to go through the Windows update, then the black screen appeared again.  I suspected the update was wiping out the graphics driver, I noticed after getting into recovery mode and enabling F8 safe mode, that the screen resolution was set to 1920 x 1080 at 64 hz with no options.  The driver was a generic Microsoft driver, and no Intel graphics driver to be found.  Intel provided a link to their driver install exe, put it on a usb, transferred it to the PC and installed, then reboot to a normal screen.  Doing F2 on bootup doesn't get you anywhere.  You can turn off the too bright LED ring there, and turn down the power brightness.Now it seems ok, but will update if necessary.  Whomever is assembling these kits needs to update Windows 10 to its latest form to avoid this terrible waste of time.  I already have other NUC's and they are great, quick, fan noise is a bit annoying but not a deal breaker, the wifi antennas are not so good, though.  I would give it 4 stars but the startup problems were a major headache and waste of time.  These are super portable, fits in a large coat pocket.  No need to buy large computer boxes at this point.  What would be nice is for Intel to do a fanless version, at least for the i5.  Did not trust other brand fanless miniPC's out there, they tended to not have the latest processors installed or had other issues like USB 2.0 in front, when we need 3.0.  I would like to see an external antenna connection on these things as well, Intel.