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I'm not a big fan of those Speck full body cases either, but my two daughters share a white MacBook and I just put a pink translucent Speck case on it - they love it! For them, its simply the aesthetics.
 
I have bought two speck see thru cases

On the MB's, at least the white, you wont notice its there.

I have one for a mbp, I put it on, and after a year, I forgot its on there, i just realized the other day in the apple stores when i felt the mbp's smooth case. It never scratched the aluminum. It wouldnt make a difference, nice either way. Though, when i take it out, it feel so fragile, so, i say get it, and if you don't like it, trash it, i don't think its that expensive, or you could sell it on ebay.
 
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