I'm still really up in the air about what I'm going to do with my upgrade. If the iPhone 5S doesn't wow me, I might be ditching the iPhone.
Had iPhones since 2007, but the last few releases have been really disappointing.
I'm in a very similar position.
I've been using each new iPhone model concurrently with each new Galaxy S series Android since the beginning. Frankly to be very candid, the many years I've been an Apple computer user dating back to System 7, has created a certain bond with the brand. So entertaining the idea of giving up on iPhone is hard.
While I will continue to use Apple computers, the thought of walking away from the iPhone is sad, yet Apple has forced me to take a hard look at any further investment in iOS. Google & Samsung have done such an exemplary job with my Galaxy S4, it's nearly perfect. At the least for my very heavy daily usage it's extremely fun, fast , and reliable. That in combination with my new 2013 Nexus 7.2, make for the type of fun experience that used to be Apples expertise.
I had an excellent experience with my iPhone 4S, however by then it's display was quite tiny by comparison to my spacious Samsung display. When one uses both platforms at the same time, the iPhones tiny screen becomes a real productivity killer.
But I've waited patiently for iPhone 6, the phone that created a lot of buzz & rumors flew that it might follow iPhone 5. That was a long time ago, and now it's readily apparent that Apples ego & greed prevailed thinking they can extend their profit taking scheme with the 5S and make us wait, yet another year.
At a bare minimum my plan is to pass on the 5S and maybe stick with my iP5 on iOS 6 which is serving me well. Then just sit back & wait while enjoying my Galaxy S4 which is _the_ single best Android next to my Nexus 4 & HTC One, that I've owned.