Every day I learn more about my Kemper - At this point I feel the KPA's foundational amp/distortion model is letting the whole platform down, as it is not warm or analog enough to be the master 'virtual tube amp' - I really hope the Kemper team will continue to hone this foundational centerpiece, as it effects every overdriven sound which emanates from this magic box - this becomes more apparent as the gain is increased. The KPA's frequency matching is *very* accurate, but the Amp engine does not distort in the same 'warm, friendly' way a tube amp does - IMHO that's why it can sound so similar, while feeling rather 'rigid'.
My 2¢ - Let the flames begin.