I recently purchased a Beelink SER8 / 8745HS Mini PC on Amazon. While I have a MOSTLY favorable impression of this mini PC system, there are also some negatives, which I will list below. I received the PC in good condition, and started installing Windows 11 Pro updates, and some of my basic user software. The good stuff first  :-)  This mini PC is REALLY FAST, and extremely quiet, with very low fan noise!  Also the fan ventilation is very effective, keeping the CPU temperatures low, even under moderate CPU loads.  Since I do some audio editing on my PC, low fan noise is very important to me, and this mini PC meets this requirement. The AMD Ryzen 7 processor is speedy, and the AMD Radeon display adapter plays videos smoothly, with high frame rates. It handles my older Windows 10 apps, without any noticeable difficulties. It has an audio output jack on both the front and rear panels, which is a handy feature, not found on most mini PCs. The build quality of this mini PC feels quite solid, and the brushed metal top cover looks great.There are also a few negative aspects to this Beelink mini PC.  First off, I immediately noticed the poor download speed performance of the internal Intel AX200 WiFi controller. Using my home 5G WiFi connection and the built-in Intel WiFi adapter, I was only able to reach a download speed of 34 Mbps, which is really dismal.THE SOLUTION : I disabled the internal WiFi adapter in "Device Manager", and connected a TP Link AC600 external USB WiFi adapter/antenna, and was able to achieve a download speed of 174 Mbps - which is about 5 times faster! Since the $15 USB WiFi adapter performs so much better, I have left the internal Intel WiFi adapter disabled, and am using the external USB WiFi adapter all the time now.  While this is a cheap fix for the WiFi download speed problem, it is also a bit of a disappointment. ( NOTE :The download performance is probably degraded because of the placement of the built-in WiFi antenna, inside the metal case. )Other issues that I have yet to resolve, are problems with "sleep mode". One problem is that even if I set the "Power Options" setting to "Put the computer to sleep : 45 minutes", this PC does not actually go to sleep after 45 minutes! I have dug around in the other device software settings, but have been unable to fix this problem so far. The other problem with "sleep mode" is that it occasionally wakes up from manually initiated sleep mode, for no apparent reason. No clue as to why this happens, although it may have something to do with the fact that this PC is never fully asleep.  This is because the SER8 system's BIOS only supports "S0 Modern Sleep" mode, which means that while it is "sleeping", Windows 11 is still running in the background, USB power is still on, and network internet activity is also happening!  Apparently there is no way to disable this "feature" in the Windows 11 software, nor in the BIOS settings.  While this is a very common "feature" (LOL) of most modern PC's, including Apple PCs, it is a potential network security issue, and it's also a waste of electric power.To sum up - this is overall a solid mini PC, despite the issues I have mentioned here.