Drivers to be reviewed
The adapter itself does not get too hot, it is very light. I tested it on two devices:
MacBook Pro of 2018 under macOS 10.15: I have the 2.5Gb/s, the adapter works very well.
On my Windows 10 PC, it's a different story. I don't get more than 560Mb/s. The 1Gb port built into my motherboard happens to be faster. I tried with the drivers on the Asus website, as well as the more up-to-date ones on the Realteck website: https://www.realtek.com/en/component/zoo/category/network-interface-controllers-10-100-1000m-gigabit-ethernet-usb-3-0-software. Too bad