I've gone on about this before, about the camera, and the proof is in the absolutely amazing photos it takes. (See earlier posts).
And it's great as a phone and doing wifi and the internet and the Reddit app is certainly a five star time waster, but these things are common to most phones.
The feature I find most useful is the pen-stylus, that embeds in the bottom of the phone and when you pop it out it automatically prompts you with a note. It accepts handwriting or text, small drawings, etc. You can embed images in it. It's really useful. I use it a lot.
This is probably the best technology investment I ever made.