I saw this advertised here a few days ago, ordered at the 1/2 price special. It came in today. If you are VERY careful and caring, the installation should take under 1/2 hour, the fit was dead on perfect, the instructions excellent, and went excellently with zero problems.
The finished look is glossy, a slight comedown off the sheen of the aluminum, BUT, I have sold some used Apple laptops on Ebay after using them for a few years, and I can tell you, a PRISTINE perfect finish on a used one almost brings in 1/3 more on resale, all other things being equal. Given that this is a high end machine { in price, not performance } the buyers will most likely be the kind to trade it in, or hand it off in a year or so, buying the newest gizmo, so the resale pricing is pretty impressive.
Yes, it does demonstrably increase the "gripping" and it is WAY less likely to slide out of your hands or off a pile of things, not as "slippery" as the brushed aluminum.
All in all, I'm VERY pleased, and I actually might end up liking the glossier look better, well, at least as much as the standard finish. Photo's make it look MUCH more "wet look" than it does in real life.
You can see it here on my Mac Album page.
Shots in my Mac Gallery Page