Wonderful value for money. As a clone of the MX master, it is very close, at half the price.
Very comfortable, slightly heavy. I have a fairly large hand and since I got it, it is constantly comfortable and I no longer feel any pain.
With one button, it changes the dpi, with one button, it changes the bt1-2-3/usb connection.
I use it for over 8 hours/day. It needs to be charged every 40-50 days. Unfortunately, it charges with micro-usb.

As for the negatives, the side scroll wheel does not work smoothly everywhere. And the Chinese application that you find on the site does not have crazy settings. Only remapping the basic buttons.

It is what you expect, but since I also have an MX Master 3, it's better to get a used MX Master for €50.

I use it more on SamsungDex and less on the Laptop. The switch from one device to the other is instant. I won't compare it to the Logitech MX Master 1,2,3. It does exactly what I wanted and more.

Generally, in terms of construction and ergonomics, it seemed good to me, but not comparable to Logitech.
The size is very good for a relatively large male hand, so it can be embraced by the whole palm.
In terms of functionality, it does what it promises, although Rapoo's software is not very user-friendly, and it is not easily found on their website.
The switching between devices and DPI works flawlessly and quickly.
Overall, if you are accustomed to this type of design and need many buttons and DPI, etc. for gaming, for example, I believe it will satisfy you.

On the negative side:
1. It is a bit light for its size.
2. The left/right click buttons are very sensitive, resulting in accidentally pressing the left click since I always have it embraced by my palm and my thumb rests on the button.
3. The position of the back/forward buttons did not impress me, but I could get used to it.

Overall, for its price, it offers many features but in mediocre quality. It is not bad, but nothing special. If you want many functions without spending a lot of money, it is worth it. If you want the same quality as Logitech, unfortunately, you won't find it. (hence the half price)