I have a 16GB iPhone 3G, and I'm contemplating getting the 3GS soon. Here are some things I'm thinking about: Does the Oleophobic screen feel any different than the existing one? I have a hunch that it won't feel glassy and sleek like the 3G's. How much has the battery life improved? Do SMS/MMS messages send quicker? How vast is the speed improvement on apps? Anything else I should know?