Performance has always been the driving factor for me when buying phones. Obviously I'm assuming Apple won't kill this phone with IOS bloat (at least not before it dies of old age anyway), and of course it's always possible they'll introduce some new feature that no one else has thought of yet (iPhone 7h for holographic?), but as it stands this is the first time I've bought an iPhone and thought, "this is it, I'm good." It just feels like we've reached that point where a few more milliseconds isn't going to noticeably improve my user experience. PCs have been there for years now, the iPad was there for me with the iPad 4, and I think there's a good chance we're there now with the 6s. Of course these things only seem to have a shelf life of about 3 years anyway, but if I can get 3 years out of this phone vs the 1 I got out of the others before I felt the need to replace them then that will save me a ton of $$$ to spend on other things I don't need =)