Definitely keeping. I had the first iPhone (the one sold in US and in some selected European countries only, unfortunately not in mine - had to jailbreak & unlock, not to mention having to meet with some weird guy on a subway station to buy it in a first place). Then I got the iPhone 3G, as soon as it was available here. Worked great, but was made obsolete quite soon with that terrible iOS 4 update that basically killed the performance. Then I got iPhone 4 and got struck by "Antennagate". So I skipped 4S, skipped 5, just to switch to the "S" cycle with iPhone 5S last year. And I'm really, really happy with this one.
So no iPhone 6 for me, I'll wait with my 5S till the next year to get the 6S, or whatever it is going to be called. And, observing the current disturbing trends, I just hope it will be smaller than the iPad mini 😉