I upgraded and do not regret one bit. I still have the 3 and use over WiFi or for my games. I paid full retail for Note 4 and this is why I feel it was a great upgrade.
1. Screen resolution and the slightly curbed display makes for a much better viewing experience. It's not as dull.
2. Photos are better.
3. Camera is less clunky, faster, and easier to take photos. I would fumble with the Note 3. Particularly from the lock screen.
4. Touchwiz and the whole entire UI is now cleaner. I don't feel the need to change my launcher, dialer, messaging app, etc because it just looks, feels, works better and is nicer and snappy. It's the little things. Using everything as is creates less bog down on the system I feel. Fingerprint scanner is a better option than password. Although it sometimes is tricky, it's way better than a password.
5. The build quality is fantastic
6. Battery life is amazing. I haven't needed to install battery doctor or any similar app yet. Note 3 drove me crazy with inconsistent battery life.
7. I use spen a lot and the experience is just better. My handwriting on the note has improved without any effort on my part.
8. Everything just feels much and works much better to me.
I debated before I got it and even the day I got it whether I made a good decision but one day of use I was sold.
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