Here's some bullet points from the experience of owners of the 780 and 770:-
- build quality def reduced from 770
- zero internal memory
- PQ and SQ similiar to 770, no mark difference
- 780 doesnt get as warm as 770
- wifi on 780 is 2.4ghz compared to 5.4 ghz on 770 (2 antenna's on 770, wifi works ALOT better on 770 therefore)
main complaints so far, not what I was expecting or hoping for.