I had the NUC7i5BNH but sold it due to the constant fan noise or coil whine which was really annoying.  I recently bought the NUC8i5BEK and I can state that it is very quiet compared to the previous (7th gen.) model.  Intel finally listened to consumers and put a better cooling system into the NUC for the 8th gen. CPUs.  Also, the Core i5-8259U is a much stronger CPU than the previous i5-7260U.One problem with these NUCs is the lack of a dust filter.  Depending on how dusty your environment is, you will need to clean out the accumulated dust from the fan assembly.  If you don't, temperatures will rise and you may experience throttling or even damage to the components.  Cleaning entails nearly complete disassembly of the NUC to get to the fan's intake cooling fins.  There are instructions on how to do this on a couple blogs and forums.I've only had mine for a few weeks as of this writing and it is running fast, cool and quiet.  I may not need to clean it for a long time since I placed a thin piece of cloth over the air intake to keep most of the dust out.