Review after 1 week of use:
The Kensington is a good choice for anyone looking for an ergonomic mouse with a "handshake" grip at a reasonable price:
- Sturdy mouse with appropriate weight, quiet buttons, and a solid scroll wheel that doesn't wobble.
- Although the category generally suits large palms (like mine), this one is more compact compared to the Gembird (see below).
- During use, the palm rests comfortably on the mouse without needing to bend the fingers for the buttons (except for the scroll wheel).
- At first glance, the "tail" it has (image) may seem strange, but personally, it worked for me as it supports the bottom part of the hand.
- It has a button that adjusts the dpi (cursor speed) in 4 levels.

Since I had no experience in the ergonomic category, I first bought the Gembird MUS-ERGO-01 Black (€10) for testing, which was discarded after 6 months due to a faulty scroll wheel. However, it convinced me to buy a serious ergonomic mouse as they are convenient and relieve wrist pain. After researching, I ended up with the Kensington, which also has excellent reviews on amazon.com.uk (it's a good tactic to search there for reviews).

EDIT [10/09/2021]: Several months later, after intensive use, I highly recommend it. The only negligible flaw is a slight squeaking occasionally during fast scrolling down.