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In Mouse

- more comfortable than others - more durable than others - better battery than others

Works flawlessly. Is large enough to fit my hand. Moves easily.

It's a corded mouse so you never have to change batteries. It's a good sized mouse, I have fairly large hands and some mice feel very small and uncomfortable and although slightly bigger mice are more comfortable for me this one feels good. It works just as it's supposed to. It matches my old Logitech keyboard.

Helps my wrist from working all day

multi-device works well long battery life good build quality (not cheap glossy plastic)

-solid build with nice rubber siding. -Pretty quiet. It's basically a muted mouse. There's just a little sound when you click the mouse button. Definitely still audible (barely) but way quieter than a typical mouse.

Black, comfortable, and cheap. It responds well and doesn't bug out.

I've always been a fan of this style of trackball mouse. I had my previous one from Logitech for about 8 years, different color; one of the buttons wore out. So far this has been treating me well for the past 2 years. It's easy to clean and I appreciate the lighter white-blue color combination which brightens up my desk. - I specifically use a trackball mouse to deal with wrist stress and whenever I go back to a "regular" mouse, my hand hurts, so this is pretty much the only mouse I can use for my daily work. - The battery lasts quite a long time. I use rechargeable AAs and rotate the batteries probably once every 3-4 months. It's hard to say as I don't keep track and this mouse does not have any battery issues. - Trackball mouse needs much less real estate on the desk because I don't have to move it around, it stays in one spot.

Build quality. Reliability. Fit and feel. Balance. Features.

Ergonomically comfortable. It can connect and can be switched back and forth with two additional bluetooth enabled pcs simultaneously.

Frictionless scrolling is incredible. Feels great in hand. Micro receiver can stay in the USB port. Lots of options in the software (though said software isn't necessary). Unity receiver makes ordering a spare easy (if desired or needed).

Great design...love the verticle "hand shake" grip. More buttons than I know what to do with. Ability to change pointer speed on the mouse with a button right there on the side of the mouse is genious.

Outstanding. You can switch between your 3 devices, and you can also use it simultaneously with two computer