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Personally, I use it with logic pro, it is very convenient to make adjustments to the sound on the fly, it is very convenient to change the keyboard layout, sound and brightness too.

In the future I will use it with some photo editing and my guess is it will be convenient there too.

Not a gimmick for me, BTW you might want to use better-touch-tool.

I guess this kind of post can be misleading for future buyers, just go to an apple store and try it for yourself.
 
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