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I bought it yesterday!
I have not tried other models because it actually has very little yen which are the same for so cheap!
What I like most is his part in one.
The only thing I do not like is that when "docked" sound can not get out by HP.
I find great value for money, AC was a long time I was lusting over but its release was costing more than € 350 so it was a little too expensive for me. A 119 € I bought it immediately!
I remake that choice without hesitation, it gives a different view of the case!

MIDI by usb is great seen!
The sound is top is nothing to say, either input or output.
It changes the headphones unable to manage correctment serious!
It sounds very strong is super well built, nothing to say!

I used mainly to control my synths and it changes the noon wifi! (Lemur, stepsequencers, arpégateurs etc ...)
I also use it as a multi-effects (the kaospad korg with LiveFX or Turnado) and as synth (Animoog, ppg etc ...)

I am very pleased and I would recommend it to anyone who wants to enjoy a max of now disponnibles cool apps on ipad.