I am using iPhone 4s from last two years . I purchased this phone because of its unique quality and world class brand . It is good quality phone and also have great feature which you never find in other phone like their cool Touch.
One of the best thing I like in this phone is its superb fine Camera clarity is awesome . When you capture photo from its rear camera it does take too much time to focus as compare to other mobile phone. It have HD feature so you can make your photo more clear. Front camera is good clarity to capture your nice selfie. one more best thing is you can takes back-to-back photos without getting stop.
But its some feature makes me down like its battery backup is too bad even if you full charge your battery at morning then battery will be low at evening without using too much.
Overall in my point of view iPhone 4S is the good and unique features phone. But if you are familiar with Android then I suggest its not suitable for you. I loved these phone