+1 for subtle eq changes making a HUGE difference to getting rid of the blanket sound.
The Kemper works very well live, That's all I am using mine for right now. I am getting a really good tone live without lugging the tube amps. The end result the front of house is hearing through the pa is every bit as good, or even better than what I would get a most gigs with my tube amp being miced up. The soundguys I have dealt with have been extremely happy with it.
It's not a perfect unit, but I am 100% happy I bought one and it is nice having all the tone options in one box. The dynamics are really good with the Kemper for the most part. There are a couple profiles that don't respond as well as others to volume knob changes on the guitar.