I've had a Kemper for about 4 years and just recently purchased a Helix along with a Variax. My intent was to use the Helix with the Kemper in 4CM, with the Helix also controlling the Kemper via MIDI, and mixing and matching amps from the Kemper with amps from the Helix for sets in the two bands I play in, along with using the Helix to control the Variax. But, in the month I've had the Helix, I've not even touched my Kemper. I still plan on going with my original plan, but I've found the Helix to be more than capable on it's own.