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I have the Satin See Thru hard case from Speck, and don't experience overheating.
 
I just heavily researched this issue and decided on the incase.

The incipio has fit issues and bows in the front. Also there are no vents for heat.

The Speck and Incase are both well reviewed, and they both have vents for heat. The main difference is the incase has a rubberized interior as well as the exterior, while the Speck has a hard plastic interior. I just felt better with the rubberized surface making contact with my MBP.

I would suggest checking out video reviews on youtube if you want a closer look, it's the best way to get an idea of the differences.
 
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