Still setting this up and testing. My configuration performs well against regular desktops for half the cost.  I cannot use bitlocker as there is no TPM chip (Not a major issue, but good to know ahead of time. One can use hardware encrypted SSD instead)The unit runs warm, but not hot. Came with activated windows 10 PRO 64 bit. The key was also emailed to me. No documentation or separate/printed license key so I suggest the first thing to do is to make a full windows 10 system backup to a labelled USB, including the license key, and put it in a safe place. After configuring the PC to your satisfaction, make another complete backup onto a different labelled USB key. This is probably good process for any PC.I note that the motherboard has configured heat protection - a very important feature for a fanless PC!For my purposes the multitude of com ports are redundant, but I can use the dual 1 GB ports, several USB ports and dual HDMI ports could be useful in other applications. Subject to ongoing reliability (I suspect that good ventilation needs to be provided) this is a good buy.