At 15 euros it's value for money, at 25 there may be other options available.
On the company's website it states 4800 dpi! And the feel is close to that.
For me, the battery cover doesn't come off.
It has a light when you change the dpi or when the battery is low.

As another user mentioned, after 1 to 2 years the scroll wheel doesn't respond correctly and while scrolling down it scrolls up.
I have changed it 3 times and now they all have the same problem, sometimes the keys are pressed twice instead of once

Very comfortable and great grip for a man's hand. It does not have a light as shown in the pictures, given that it is wireless. The design is very good, quiet and accurate. One downside is that the battery cover comes off very easily, possibly due to a not very good design in the closure, which becomes a bit annoying.

I previously had an Anker mouse, again ergonomic/vertical, and I imagined that this one would also have no difference. Unfortunately, I couldn't set it up correctly. No matter what I chose, when it stayed without me touching it, the mouse pointer danced on the screen and when I lowered the DPI setting, I had to "struggle" to get the pointer where I wanted it. Also, the battery cover would open. I had to set it aside and order another Anker that works perfectly from the first moment without any additional adjustments.

Only disadvantage: After 1 to 2 years, the wheel does not respond correctly and while scrolling down, it scrolls up.