I have two of these i7 based NUC.  Generally like them a lot.  I wanted to report, however, that one of them (purchased within the last year) has developed a bad fan.  I'm hoping this is an easy to get part.  Symptom is a grinding noise - blowing out the fan seemed to have helped a bit, but my experience with typical PC fan is that this symptom is a precursor to full failure.Updated - both of the NUCs I purchased in 2017 were basically dead in 2020.  Same problem - fan bearings failed.  These devices have a cooling system that is similar to a laptop, with heat pipes and fan pushing air through a heat exchanger.  According to Intel the fan is not field replaceable.  In any event, I can't recall any HP/Apple/IBM/etc laptop that I've owned owned the years ever dying with a bad fan bearing.Needless to say, I will not be purchasing any more NUCs.  Expensive lesson for me.