I said it before, I paid 340 for a used note 3 and don't regret the purchase. I'm not sure I'll upgrade to the Note 4 either.
Unfortunately, I haven't found a phone that meets my needs to stick with for more than a year to 18 months. But, the note 3 ticks a lot of boxes and it may be a keeper. I'd sure like a keeper so I stop spending cash! Maybe put that cash toward a note 12.
Anyway, battery life for me is stellar. Not that I have high standards, but I'm making it through the day with decent use and I don't need to charge it until bed. This is the first phone to do that for me (iPhone 4, galaxy s3, nexus 4, nexus 5, and other old Windows phones before android and ios). The other phones I listed needed a charge by 3pm.
I also have big hands and this phone is the best size for me. I can use one hand most of the time. But, I've yet to try a 5.9 device, so who knows on that front.
Camera is great, but I would like ois. I would also like a brighter screen like the s5, but the note 3 isn't terrible in sun, just not great. But these are minor things in my daily use.
This is really a great device.