would upgrade if I could, but I want to hold on to my 4S for the same reason Im holding on to my iPad 2, fanboyism, they were supposedly the last designs jobs had a hand on, so I want to keep em.
I will upgrade once the real iPhone 6 comes out, with the aid of a contract renewal so I keep my 4S.
That's exactly what I'm not sure if I'll upgrade to 5S.
I love the 4S design, the fact that it's the last model with the 3.5" screen and 30 pin connector. If and when I do upgrade, I will be keeping my 4S.