i have both and have done tours using the kemper for its amp and the axe-fx for its effects. i put the kemper in the effects loop of the axe-fx and put the fx loop after mono fx and before stereo fx like delay and reverb. it worked pretty well but in the end i felt that somehow it lost something compared with going straight into the kemper (in terms of the amp sounds) its also a lot to lug around. now i go back and forth between the two, wishing the axe-fx had better and easier clean amps and wishing the kemper had better routing possibilities...
KR