Want to know all the stuff Apple didn’t disclose and other review sites didn’t even mention? Like an faster WiFi chip accounting for better transfer speeds? Or an improved vibrate mechanism? How about benchmarks on exactly how much better at each task the 4S is?
If you’re on the fence about the device (especially if you’re an iPhone 4 user) and need concrete data to decide on the purchase, this is the only review you need to read.