Having a full DAW on the go is a killer feature imho. The promise has been there since stuff like 8tracks on the iPhone 3G, and various Audio Units already on iOS. But I’ve always found the workflow very limiting or clunky. (Edit: I’m a Logic Pro user on macOS so my comments reflect getting things into that specifically) The divide from putting down an idea when it hits, to working it into something, has always been…
As developers of professional audio plugins this is very exciting for us. The horsepower is there and the touch interface allows for some really cool possibilities. We already enjoy using AUM and Cubasis, but will be very interested to see if support for pro hardware improves now on iPad.
I had always assumed pro-level DAW users would want lots of knobs and sliders to change as many parameters of the sound as easily and quickly as possible.