Meh, can't say I'm a big fan of the look. Because the cayman has that swoop in the sideskirt that leads up to its intake, the vertical intake grill looks funny without it, to me at least.
Now, in the Cayman Tequipment catalog I saw that you CAN order an intake grille in the silver color that the boxster's comes in. Porsche just kills me--what's stock on the Boxster is Tequipment on the Cayman.
So, if one were interested (meaning one liked the contrast of the silver piece as opposed to a body-colored one), one could find out how much that version is--it might end up being more economical than buying the regular one and having it painted to match the body.