The sound guy at one venue we play (i should say, its not a very high class place :)) has stated a few times that he thinks the FOH sound would be significantly better if I had a cab and he mic'd it in a traditional manner. I dont even take cabs to gigs anymore, so thats not gonna happen. I think by default he is adding/subtracting eq's etc as he does for his normal cab mic'ing technique/position and just doesnt was to mess with his favorite desk settings through laziness - instead of using his ears. But so be it. I see it as a reflection on him more than anything.
I guess this particular person is the only issue that the Kemper has produced for me in a live situation - and I cant really blame the Kemper. :P. Every other sound guy loves the convenience and I ask most after the show if they needed to do anything fancy on my eq. Most reply with something along the lines of "Nope, just set everything back to being pretty flat and it sounded great". Seems old habits die hard for some.