I have ableton Push, but I need a smaller controller that able to put in backpack, this is the best solution for me so far.
Although it's not flawless, some function is not as good as Push, but the solid knob and great quality pad,it is enough for me.
I've use Ableton for ten years, mainly produce. I am not a good keyboard player, the scale of Atom SQ made me decide to buy it. It's really handy to change key or use different mode.
Looking forward Presonus to upgrade the software , Atom SQ is beautiful and so much potential. It's a good thing for this company made a smart and creative controller.