I spent a week with the iPhone 6S and 6S Plus (in rose gold and gold, respectively), taking them everywhere I went, from farmer's markets in New Jersey to tailgating at a New York Jets game, to commuting on New Jersey Transit through the Meadowlands and to my kid's meet-the-teacher night. I showed them to my friends, my family, anyone I met and got their opinions, too. (For on-the-fly impressions, check out my weekend diary.)
I might take the miracle of tiny, powerful smartphones for granted, but I can't shake the feeling that the iPhone 6S doesn't, at this moment, have the "one big thing" to make people want to upgrade from the 6. That doesn't mean it's not a better phone, of course it is. Right now, however, it's a promising upgrade from the iPhone 6, not a revolution.
But if you've been holding off on getting an iPhone for a while, don't wait anymore. Get this one (or its big-screen sibling, the 6S Plus). Just make sure you don't buy the 16GB model.