Hello there! I like this topic.
Personally, I like to own the best thing available as soon as it comes out, and for me, the Iphone is a prime example. Sure, the Iphone 5 will be coming out sometime in the near future, but that's no reason not to purchase the 4s. As a 4s owner, I can tell you, it's WELL worth it. Siri is something I can't live without now, and the sheer performance of this machine with it's dual core processor and it's 1080p video is something that I just MUST have. Many people will argue that the 4s is just a refinement of something that's already great, but the jump from the 4 to the 4s is, for me, simply too great to ignore. It's not for everyone, but if you can afford it, I would definitely say go for it. I hope this helps!