Is it worth the money for a iPhone 4s?

I currently have a 2 year old blackberry and want to change to a iPhone 4s. But is it worth the price? The reason i want an iPhone 4s and not an iPhone 5, is because 1, the iPhone 5 is way to expensive for my liking and 2, i have a docking station and lots of spare chargers for apple products that would come in no use at all for the iPhone 5.
So is it worth the money? How does paying by contract work? (I've never been on contract)

I would say yes it is worth the money. The iPhone 4 is already 2 years old. A couple of people I know have the 4, and its very laggy on things like taking a picture or even typing. Ios 7 is coming out very soon, and it will be optimized to run on the iPhone 5 and newer. The iPhone 4 will be VERY laggy when it gets ios 7. The iPhone 4S will be better than that and shouldn't be very laggy. So I would say if you want something that can at least take a couple of pics fast and type smoothly and will be able to work better with new versions of ios, then get the 4S. As for the contract thing you basically just pay for minutes, how many texts your going to use ( p.s. If you text someone else who has an iPhone Ipad iPod or MacBook, then your texts are free. So if you know lots of ppl with Apple devices and you only chose to have 200 texts but you sent 400 iMessages then it wouldn't matter. IMessages are FREE! Yay. Lol. Also, with an iPhone, which is a smartphone, you have to select a data limit. I have a 2GB data limit. But I'm at home most times and have Wi-Fi here. But if you don't have Wi-Fi at home or are out a lot I would suggest getting a higher data limit for your phone. Hope all this helped.