I bought this because of the 5900X and 3080, hoping that the rest of the components would be serviceable enough to make this a good deal. If you're doing the same and know what you're getting into, then fine. If you're buying a prebuilt because you *don't* know enough to build your own then I wouldn't recommend this.
First, I got the ASUS Prime X570-P board as everyone else. This board only supports RAM up to 3200 MHz, so don't bother getting faster RAM than that unless you upgrade the motherboard first - which is a huge job for a novice.
Also, the motherboard itself doesn't come with Wifi or Bluetooth. They have included a PCIe wifi card, but it is very slow and doesn't do bluetooth. If you plan on using ethernet (recommended) then maybe the spped won't matter, but my desk isn't in a place where ethernet would be easy to run. I bought a $45 wifi+BT PCIe card and my download speed went from 20 Mbps to 400 Mbps. This job is easier, but still could be daunting for someone who bought a pre-built because they haven't touched the inside of a computer before.
Back to the RAM: even though the RAM it comes with is 3000MHz, you have to load into the BIOS of the system to enable DOCP otherwise it will run significantly slower than that by default.
While you are in the BIOS, you may notice that the AIO Cooler Pump is listed "N/A". This is because they did not plug in the AIO pump to the clearly labeled AIO pump spot in the motherboard, and rather plugged it into the spot where the CPU fan is supposed to be plugged into. The AIO pump is supposed to be on 100% all the time, and it seems they altered the CPU fan curve to be 100% all the time to make this happen (something you can do in the BIOS). However, if someone went in and tried to tune their CPU fan, it wouldn't work because the CPU fan is actually plugged into a chassis fan port, and they would just be changing the operation of their AIO pump, which you don't want to do.
You can plug the AIO pump into the right spot, but then you have to plug the CPU fan into the CPU fan spot on the motherboard because otherwise your computer will be very rightfully concerned for your apparent lack of CPU fan and send you back to the BIOS. I have no idea why they did all this unless they were just concerned about how to cable manage the wire for the AIO pump if it had to plug into the correct spot. That said, they had no problem stretching the RGB wire for the AIO pump to the point where it is pulled completely taught and looks like it's holding on for dear life. Of, and the "cable management" for the AIO pump power cable plugged into the wrong place was wrapping it around the AIO pump and tubes a whole bunch of times to deal with the extra slack they got from plugging it into the wrong place. See the photo below, it looks stupid.
To their credit, I guess, they included the motherboard manual so this was somewhat easy to fix once found, but it would have been super easy to miss because nobody would expect someone to run their cables like this! I only noticed because the BIOS didn't see an AIO pump and I thought "oh, that seems like a problem".
As others mentioned, temps are bad under load, lower 90's C on the CPU. Both included case fans and the AIO fan are set to exhaust. I bought some cheap 120mm fans, put two on the top above the motherboard for exhaust, but then flipped the two included case fans to intake placed on the front of the case and added a third intake fan in the bottom of the front of the case. With the front panel off, this dropped the CPU temp under load to 77C, which is decent. When I put the front panel back on the temps went up to 80C, but this is OK enough for now.
Another thing I saw mentioned by others- you technically should be able to add 5 fans, but unless you get 15mm thick fans there will be two spaces, either on the front of side of the case, where 25mm fans won't fit because they'll interfere with each other.
And by the way, I had to learn all this myself with the help of my more tech savvy friends. If this is all complete Greek to you and you don't have enthusiast friends willing to help you, then please don't buy this thing.