One thing that Kemper has done consistently that Fractal has failed horridly at is keeping a consistent platform such that any tone you had before an upgrade, will sound exactly the same after an upgrade.
Personally, this is an extremely important feature for me which trumps pretty much everything else. I don't know about you guys, but I have TONS of hours of dialing in tones for different songs and sets that I rely on sounding the same after an upgrade.
I just can’t imagine starting again after crafting so many live patches over 18 months. It would have to be a revolutionary product to make me start again.