On another forum, I have been debating the value of a device like the Kemper that I have had since 2013 ..... that through over a decade of updates, the original rigs that I have from the very beginning, still sound exactly the same today.
I was surprised to hear that when Fractal updates the firmware, the users sounds can all be changed. People who own a fractal pedal all seem to think this is just normal. For me, I (like others) have spent a great deal of time making rigs that sound good live for the set lists I am doing live. If I had to go through and tweak every rig every time a firmware update was released, I might have to throw myself off of a cliff! .... and yet, there are some who are OK with this (I am thinking they don't play live much, but maybe they do?).
I have a buddy that has an Axe III Fx. We have spent several weekends jamming back and fourth between each others rigs and playing around with the settings. My observations are as follows:
- The rigs I have honed on my KPA Rack for live sound better live than what we were able to obtain using the Axe III Fx
- I can obtain a specific "tone" faster on my KPA than he can on his Helix.
- The efx on the Axe III Fx are generally better than the KPA and are much more flexible; however, the reverbs and delays are close to my ears (I know there are some that really feel the need for an Eventide ... but good Lord knows there is certainly nothing wrong with that pedal either).
- The KPA is considerably less expensive than an Axe III Fx (but not an FM9 I think). A Kemper Stage is comparable to an FM9 in price.
I personally like the KPA rack and the Kemper Foot Controller as a live rig as I have only a single Ethercon cable going out onto stage which reduces the clutter around my live stage position. Also, it is a very robust gigging rig. If you don't gig much, this might not mean as much to you.
I personally think that the amps with more "touch" sound better on Kemper than on the Axe III Fx. They also "feel" better to me (if that makes any sense at all).
Take this all with a grain of salt though. I am MUCH more experienced with the Kemper than the Fractal. I do love their PC editor though (I am an Electrical Engineer though .... so I like complex routing capabilities).
At the end of the day, since I play guitar in a band, I like to have the ability to create a sound quickly that sits in the mix well, and that doesn't need tweaking forever (and doesn't change when a new firmware is released!). Because of this, I feel the KPA is a better tool for the job I want done.
I don't think anyone in the audience would be able to tell the difference between a Kemper and an Axe (or a real tube amp that is miced for that matter). Both are the top-of-the-line for digital amps.