the aux in for phone is horrible.
I tried an Audio-Technica ATH-M30 X and the sound is horrible. I thought it was the headphone, then I tried the head in my laptop and mobile as well and the head's sound was great. Then I realized that was the aux.
In general, with a LT metal pedal Blackstar plus a Kramer Barreta Special, the sound is killer ( unfortunately now I need to play on guitar rig 5 with a behringer U-Phoria UMC404HD).
Anyway, it worths, but the aux in headphone, no way.
BTW, thanks Thomann.