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Do a search here for your question. There has been many posts concerning this topic recently.
 
http://mroogle.*************/

Do a search here for your question. There has been many posts concerning this topic recently.

Not only recently, but all the time. BTW, its useless to ask this question on here. Youll never get a straight answer. Research yourself, you will be more successful.
 
After owning both: Incase. Speck was inferior in every way.

This seems to be the consensus. But of course, people that have speck will defend it b/c its what they have. I have incase, had it about a year, fits tight still, no dust leakage, no heat issues, no problems. But i did get it b/c it had better reviews, had a better design, and b/c speck cases looked super cheap at the time. Speck looks better now but i doubt the quality is any better.
 
I will say this, I am buying another Speck product due to Incase's lack of ability to get products out and I don't want my MacBook Pro running around naked. Incase is normally slow, but this 17" has been really slow.
 
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