This is a right handed mouse, and there are forward/back buttons near the thumb as an aid for navigating the web

Comfortable hand size and ergonomically sound.

My hand rests comfortably and doesn't cramp up as much using this mouse

It fits my small hand very well.

This mouse fits my hands well and is comfortable and so far reliable

It's a bit on the small size - fits my hand just fine but was a little awkward for my giant son's giant mitts

I'm right handed

If I have to use a mouse for an extended period of time, my hand starts to cramp up

This mouse is ergonomically designed to be used by a right handed person and it is extremely difficult to get used to the ill fit in your left hand

hurt's my hand after a short while. would not buy again but keeping as a backup

Something to think about if you are left handed or like me.

There is an indention with a rough surface where your thumb goes (if your right handed).

This may not be clear to a non gamer but if you play Minecraft, it important to winning a

Finally, Amazon's mouse is Windows only and while it might work in some capacity with Mac systems certain features, such as the browsing buttons, will probably not work