Push controls almost every control every aspect of live and Push isn't really building on what Live does it's just simply the controller for Live that people like myself have been asking for,
No doubt Push looks great, and offers the control people have been asking for.
BUT, can you
Adjust user waveforms in Operator
Adjust Sampler Start/End points
Store/Recall Rack parameters
Make a sequencer style melody without some wacky workaround with a drumRack and/or M4L
Record Automation of Return Tracks and their racks Macros
load a Space Echo emulator or Reverb that sounds good
navigate to something in Arrange view and adjust anything
I could go on and on.
Not that Maschine does any of that either, I found Maschine to be annoying when trying to use it within Ableton.
Nevertheless, I got a lot of love invested in Ableton, NI, controllers and hardware, yet I see a lot of room for improvement.
Live 9 is gonna be great, but there are still a lot of things missing.
For "almost every aspect" of Live you can name, that you control, I bet I can name one you cant.
I'm gonna go one further too,
I bet customizing PUSH with Traktor is way easier and more flexible that it will be in Ableton Live for years.