It’s their Magic Mouse. You can’t use it while it’s charging (since its port is on the bottom) and it also has questionable ergonomics since it’s very flat and thin (but most mice also have questionable ergonomics as well so there’s that)
If you want comfortable, you don't get a mouse. You get a trackball that fits your hands well. I use an Elecom Huge and I love it. Especially having 7680 pixels of horizontal resolution (1080p side monitors and 4k center screen). Going from edge to edge with a single flick is so damn satisfying.