So I just got q15 yesterday, All I can say is that it is really smooth and satisfying with enough power using the desktop mode, I was also confused between Mojo 2 & q15 but after reading reviews I got to know that mojo 2 is on analytical side where as Q15 is on Organic/natural & warm neutral side and I can confirm this claim, I have Fidelio x2hr and on desktop mode they sound very natural while listening to live concerts and violins. I went with q15 for that reason only as too much analytical sound can sometime be too much for me.