dmatthews
Dave's not here
I ran my Kemper through the return on my Custom 50 combo.Also, I'll throw out there that if I do get a modeler like a Kemper, I've read that pushing it through the effects loop instead of through the front of the amp really helps get the tone from the modeler much cleaner. So in essence, everything just goes in front of the modeler, and then the modeler goes into the effects, and the preamp on the amp would be ignored.
I like this approach, because I don't have to buy yet another piece of kit to carry around (ie FRFR cab).
It sounded good, but I think it depends on the profile chosen. That and the fact that I was using the speaker in the Custom 50 all the time, so it was less versatile in that config.
You definitely get more of the well rounded features (speaker imprints, amp choice etc.) when using monitors, PA, FRFR and such.