Seeing that I had read a lot of unhappy type threads on the subject, I thought I'd post my positive experience 
Yesterday evening, I auditioned for a local covers band, my first ever audition (it's always been the other way round for me) and my first chance to play the Kemper outside of my music room.
Rig was; Kemper toaster > DXR10 > FCB1010 (with uno4kemper 1.2). I had setup one performance, consisting of a tworock clean, Morgan AC30, 2x Top Jimi Superlead 68 (3 & 4) and and acoustic amp.
First off, unlike my old POD HD500 rig (POD HD & Tech21 Power Engine), feedback wasn't an issue, the DXR10 has tonnes of room, secondly, there were no surprises! The rigs sounded like they did at home, just a whole host louder 
Bit of a pointless thread really, but it might help eleviate someone's concerns
Dave.