I think I'm going to keep my 5s and trade in my Note3 for the iPhone 6plus. Been kinda busy and haven't done any research so I'm not sure how much a trade in would be worth......still contemplating.
The best thing about it (and I think other trade ins work this way as well) was that I got to hold onto all of the accessories. So now I have multiple lightning chargers. I had a cable go bad on me so I'm happy to have a backup for when/if my current cable decides to give out.
Traded my VZW iPhone5 32gig for $200 off my Iphone 6 128gig. VZW gave me the $200 instally, so I ended up paying $199 + taxes and etc out the door.
I sometimes miss the smaller iPhone, but got over that real quick. IPhone 6 is sweet!!!