Not sure what you mean about the plastic sticking to the finish. I originally got the Incase Blueberry hardshell when I bought my MBP 13. Today I exchanged it for the Black Speck SeeThru Satin. The Speck does not fit as well as the Incase. It also has a slight "snap" sound when opening the lid (Incase never did).
Speck finish has a slightly more rubberized feel, high gloss on the inside of top/bottom which can hold more dust vs. Incase. What I do like about the Incase vs. Speck is the bottom shell. It has a full clip-type along the back where the screen hinge is. This keeps dust out better than the Speck.
What I plan on doing is returning the Speck satin black to Apple and try out the Incase perforated black. Best Buy has them along with the Incase black hardshell similar to the blueberry I had. That way if I don't like the perforated one I'll go back to the regular one.
I like some Speck products but for my MBP I like Incase better.
EDIT: forgot to mention that the mag power plug sits a bit better on the Incase - Speck not as good.