For in ear use, work at lower volumes, or headphones work ......... a feedback feature is an important thing to me. When playing my Bloody Rocka amp even at lower volume with 412 cab, I can feel the tendency/willing of nice harmonic feedbacks coming. When using the kemper with headphones or with lower monitor level I do not get these feedbacks, which are part of guitar playing/interaction between guitar, amp and cabinets.
So a feedback option with some adjustable parameters would be a step further and closer to real thing to me.
cya, ACY!