Truly ergonomic and silent, it does exactly what I bought it for. High resolution (customizable). The side buttons are indeed NOT silent, but personally I don't use them very often so it doesn't bother me. I only remove one star because of its size: it is small in my hand. It gets lost in my palm (I wrap my whole hand around it) so when I want to scroll with its wheel, I have to let go a bit to find where the wheel is (see photo).

very nice mouse, for me significantly more comfortable to hold, but when you click it has a different feel. Essentially, you don't press your finger down, but you "pinch", now the thumb is also slightly activated. You get used to it, but double-clicking requires a bit of concentration...

For the review of this specific mouse, go straight to the last paragraph.
Personally, I need extra buttons on the side, which must be programmable. But above and beyond any (useful or useless) features a mouse offers, the most critical thing—not just for me as an engineer, but for everyone—is not so much the sensor and the dpi (nowadays, it's rare for a mouse to disappoint you, even the cheapest one), nor its shape and weight (I'm not saying everything suits everyone, but generally, you get used to it). The most critical thing, something I'd be willing to pay whatever it takes for, is the DURABILITY over time in the smooth operation of the three main buttons:
1) drag n' drop,
2) double-clicking, and
3) smooth scrolling of the wheel.
For 1 and 2, I'm not only referring to the left button, but also the middle one (vertical wheel press), which, for example, in AutoCAD does pan and zoom extends, respectively.
Well, after a lifetime with expensive mice, especially after 2020, there isn't a single one where these classic functions lasted for more than a period, from 1-1.5 years max to just a few months. I've thrown an expensive Logitech at the wall because drag n' drop would release files and folders wherever and whenever it wanted (DAMAGE was done this way, and I don't mean to the wall but to my effort and sleepless nights), on another top Razer the wheel instead of scrolling pages down would go up and down as if it had epilepsy, another supposedly professional one (with the name CADmouse Pro, no less) in three semesters the wheel/middle click went off, to cut a long story short, expensive mice with amazing features failed after a short period of use in such simple but critical functions.
Manufacturers have for years strategically decided not to make peripherals but consumables, so any price above what each considers reasonable to spend annually should be prohibitive for any consumer who doesn't want to fall victim to imposed planned obsolescence. No, the saying "you get what you pay for" does not apply here, from long experience.

After this necessary introduction, let me say that the Natec Crake 2 Pro is a very HONEST mouse for general PC use, it has an unexpectedly good feel (since I had never tried an "ergonomic" one before), the left and right click are truly silent, though not the side buttons, which can, however, be easily programmed with Natec's software, and there is also the touch of many different RGB lighting effects (for those who care about that). At the price of 11.58 euros that it currently costs, it is a very decent choice for most people. Unfortunately, though, the important for me middle click (pressing the wheel) is very difficult to use and does not serve me in the specialized applications I use, perhaps due to its side position in such an ergonomic layout, so I will look for something else in a similar price range, knowing now full well that even if I spend 150 euros (which I have), within a year at most I'll be looking for another.