Good left-handed vertical mouse (stable, easy click)
I bought a vertical mouse for my right hand (Trust Verto) and this one for my left hand (DACOMEX V150UG).
I got used to the right one right away and I have a bit more trouble with the left one (I am right-handed).
I have two of them depending on the layout of my work surface.
I had a normal right-handed mouse and changed hands after my wrist started to hurt.
Now I find it comfortable for my wrists to have vertical mice.