The product is unsuitable. As soon as I got it, it had flickering movements on the screen. It's not that it's not nice, it just doesn't work.

I have small hands and it didn't suit me very well. For larger hands, the grip is fine.
Otherwise, it's garbage. The construction is cheap plastic, very heavy, not suitable for gaming.
The buttons cannot be programmed.
Of course, the icing on the cake was that after 4-5, the DPI started changing on their own.
Obviously, it was defective within the warranty period and of course, I didn't replace it, I got something else

The two buttons cannot be programmed nor do they do anything. And there are no instructions on how to change what each button does since there are so many options available.

This specific product is not worth it. It is very heavy, which will make it difficult for many, especially if you play games. Also, although Trust advertises this mouse as having "9 programmable buttons," this is not true as there is no software/launcher available. Finally, as if all of this wasn't enough, the one I purchased turned out to be defective as it would change the dpi on its own and within just a few minutes, the cursor would go from low speeds to unrealistically high ones.