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Not really. But if you decide to buy one, please don't pick the Magic Mouse... it's expensive and it sucks.

You'll be better off with an average USB/bluetooth mouse.

Hey, speak for yourself. 😉

I use a magic mouse 8+ hours every day and I love it - especially with an add-on app like MagicPrefs, which lets you define custom gestures.
 
Trackpad is good enough by itself for most tasks. I also use a magic mouse for my IMac - I'll agree with others that the magic mouse takes some getting used to, but now I like it a lot.
 
Thanks for the comments, I will most likely use trackpad but may get mouse later on depending and to make the trackpad last longer.
 
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Hey, speak for yourself. 😉

I use a magic mouse 8+ hours every day and I love it - especially with an add-on app like MagicPrefs, which lets you define custom gestures.

I quite like my Magic Mouse as well, but I'm a claw guy so ergonomic mice do nothing for me anyways.

I've mostly transitioned my desktop use to a Magic Trackpad these days though..
 
Another thing is that I believe you lose the ability to smooth scroll if you plug in an external mouse. That's a deal killer for me
 
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