I am using this phone from last 6 months and its an wonderful experience so far. As this phone is very user friendly you can access all widgets on the front page itself.
The reason I bought 4s is unbeatable design. The body of the phone is very tough. It may hang sometime when you keep lots of app. battery back up is not great as entire battery gets drained after 6 hours of use.
The music quality is just superb and it is far better than other brands. Camera quality is average but if you use camera apps it will allow you to take nice pictures. This phone is value for money as it is available in very less price and anyone can afford it.