I am still using the orignal issue iPhone that I bought on the very first day it was released. Still works great, and with the software upgrades, even more useful than before. Sure all the new stuff is great but I don't really need it. Besides I have stereo BT with a dongle that works great and that takes off even more pressure to upgrade. So when something bigger to upgrade to appears I'll be inclined to consider it.
I've been around computers since the the IBM PC XT and Mac SE days so it takes somewhat more to impress me these days.