I can attest like others, my phone is fine and so is my wife's (purchased 4 hours apart from two different locales for reasons of saving $50 on hers). One day later, I purchased two iPhones for my kids. Four new smartphones in less than 18 hours. I can say this, like others stated here - the ecosystem is what makes life with the device easier. I live in both primary ecosystems and I will tell you this, the S3 has a much richer feature set and a plenty good interface while the iPhones have a better quality build tactile feel and a nice link between OS and hardware. I am frustrated that I can't do certain things with my iPhones that I can with my S3 and at the same time, the different makers of Android products feel the need to skin everything which makes the Android ecosystem sometimes diluted and frustrating. Case in point - DLNA and NFC functions for Android and Samsung are both mutually inclusive and exclusive (if you can believe it's possible) at the same time -- depending on what you want to do. Then the carrier throws in apps as part of their skinned version of the manufacturers skinned version of the Android OS which makes it even more infuriating. The cleanliness of the Apple product is wonderful but also, limiting as Apple does not seem to adopt ubiquitous solutions readily and their innovation is half step behind Android.
So, with that said, we wish you the best of luck. I recommend a sturdy case like an Otterbox to provide stiffening support of the phone body and get used to the functions that are found under Settings->More Settings... see some of my posts that helps remove some of the mystery of how NFC/S Beam/A Beam/WiFi Direct and DLNA/Nearby Devices/AllPlayShare work -- either natively or together or not....