First impressions, after a recent purchase. Keep in mind that I come from a much more expensive mouse (Logitech MX Vertical), which, however, presented serious malfunction in the switches after 2.5 years of use and disappointed me. Nice design, which satisfactorily meets the standard of an ergonomic mouse. The RGB lighting, customizable through a desktop app, makes its external appearance even more beautiful and impressive. Good construction quality, with materials made of plastic that doesn't look cheap at all. Good grip and very pleasant (quiet and soft) feeling when pressing the buttons. The size is a bit small for large palms, of course, but it works just fine without any major issues. The OLED screen on the top is nice and has a unique touch that serves a practical purpose, as it provides useful information about the device (selected DPI, battery level, and connection mode with the PC). Overall, compared to the MX Vertical, I would say it meets the expectations and doesn't lag significantly behind. Not to mention that it costs almost half the price, which makes it an even more attractive choice. If its durability proves to be relatively long, then it will definitely be a value-for-money purchase! Extra tip: Among the available colors, choose the blue one, which, in my opinion, suits it very well...

UPDATE 4-12-2023.
I have a small issue with the cursor movement and the accuracy of the mouse, which I find to be better with the MX Vertical so far. Not that the Delux disappoints, but it just doesn't give me that feeling I'm looking for yet... Maybe it's a matter of transitioning to the new mouse and getting used to it, which will come with time...

Very comfortable to use. Initially, it is difficult to get used to because of the vertical design, but after a while, you don't want to go back to traditional mice.
Accurate movements, convenient buttons for various functions. Good battery performance, personally, with one charge, it lasts me more than 2 weeks of continuous use.

I had bought 2 of these mice two years ago, for myself and for a colleague. The first impressions were very good, but the bugs and problems are many for a 50 euro mouse, and for that reason, I DO NOT recommend it! In detail:
Aesthetically, it looks like a quality construction with nice and soft materials.
Very comfortable grip! (you get used to it in a few days) The click on the buttons is silent and very soft, smooth feeling.
The battery lasts 6-7 hours of work.
The optical sensor is cheap, worse than a 10 euro mouse on the same surface!
From the software, all the buttons can be configured, the LED color can be adjusted, and it also supports macros.
On the plus side, the packaging includes 2 covers for the back (the honeycomb and a plain one), so you can use whichever you want. The detachable wrist rest has not been comfortable for me, and I have never used it.
However, since the beginning, they have released various issues: The battery percentage is incorrect, as it runs out from 25% to 2%! Sometimes it freezes and needs to be turned off and on again to wake up! The LED light started to malfunction on one. The scroll wheel on one mouse is acting up, and on the other, it completely broke, and I had to return it because you can't work without a scroll wheel! The screen turns off for no reason sometimes and only lights up when you press a button momentarily, while on one, its brightness is dimmed. The button that changes the source often requires multiple presses to go to the next setting (sometimes it works on the first try, and other times it takes 10 presses!) Based on all this, I would say it is a cheap construction that they managed to make look quality!

This specific mouse is very good compared to:
- ms sculpt ergonomic: it is not durable at all. The side button broke in less than a year.
- anker: the buttons were too hard for the thumb and I developed tendonitis, even though it needed some resistance, it hurt a lot.
- logitech master s2: it felt too small and not as ergonomic as the ms one.
- logitech g502: not ergonomic at all. In my opinion, ergonomics = vertical mouse.

positives:
- the battery is satisfactory, not amazing
- can connect to multiple devices

negatives:
- the software took hours to download, obviously their server is/was not the best.
- if you have a large palm, it probably won't be comfortable. However, I suspect it comes in 2 sizes.

alternative: logitech mx vertical ergonomic, but I think I already have too many mice..