Ive been a long time Axe Fx II user, almost since the beginning on and off a few times. I recently sold my Mark II version to upgrade to the XL+ because I wanted the extra memory slots. I decided to try the Kemper in between. I had it for under a week before I sent it back. My Axe Fx was running the newest quantum firmware before I sold it btw. The Kemper just felt very stiff to me, it didnt have that nice ma "feel." Plus I didn't have any of my own amps to profile so I was relying on other peoples profiles. This,imho, is the downside to the Kemper. I even bought a few of the highly rated profiles from top jimi,amp factory etc etc and none of them sounded really good to me.
The time had come last week to finally reorder my Axe fx and the damn things were out of stock. Look at AMS for the Line 6 Helix and it was finally in stock so I figured I would give it a shot while waiting for fractal. I got it yesterday and my initial impressions are really good. So good that I've decided to keep it and not reorder an Axe FX. Tonewise, if you set up a good patch its almost on par with Axe FX(and thats coming from someone who's been with Fractal for over 4 years) but more importantly it "feels" like a good amp. Its feels much better than the Kemper did to me.