I did both of my latest albums in N6, and I still hate the mixer. I like the flexibility, but hate the look and the increased time that I waste having to click around to see anything of any use. For me the increased feature set from N4 has mostly been worth it.
However, it is more important to me that they fix the basic mistakes in coding. For example using a particular tool should never cause a bunch of MIDI notes to change octave. 
DG