I recently bought a Speck see thru CLEAR for my Unibody MBP. The reason I went for the CLEAR case is because I just love the look of the unibody, it's gorgeous and I didn't want to cover it and sacrifice the look. Tbh if I wasn't worried about scratches etc I wouldn't even consider of getting a case for it. But since I take my mbp to work and in the studio, it's prone to bumps and scratches so I decided to purchase the case.
It's self preference really mate. For me I would never get a case in any color other than clear.
I have the satin and I really like it. It's got a nice, grippy surface and it makes me feel more confident when I'm handling the machine (i.e. less prone to drops). But I agree with jaskaeyes, it really is a matter of your personal taste.
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