I bought this unit to be a music server for my house.  I has 8 gig of RAM and a 128 GB M2 SSD for the boot drive.  The software/OS is ROCK (Roon Optimized Core Kit) which is a custom Linux.  The NUC has performed flawlessly since it was assembled.  The only hiccup that I had was in installation.  The NUC bios/UEFI would not recognize the M2 as a boot drive when I put it together.  The M2 was listed as a device by the bios but was not listed as a bootable device.  Eventually I disassembled and reassembled the NUC/RAM/M2  and the bios was happy at that point.  Loading the ROCK OS proceeded with a hitch.  The NUC has been running for over a week with no issues.