I don't think we really need to worry about what the Axe-FX users are saying, Mr CK. There's just so much more to a great product than attacking the competition.
And by your congenial and approachable demeanour (in the German "I'm so serious" way, hahaha *clap clap* ), I think you know this too!
I had brought this up in another thread, on the tweakability of the profiled sounds on the Kemper. Judging by mdeeRocks response here, the simple explanation for the reason why users don't really get caught up in the deep editing parameters is they don't need to, not because it can't be done.
Of course Kemper is very tweakable. Lots of less vocal (on the internet) people just prefer to play their guitars instead of messing around with numbers, Kemper enables this. Having good base (profile) is the key and (IMO) most factory loaded profiles are very good. This is the one thing (and how it feels) which (for me) makes Kemper amp much better solution than anything else digital.
IMO, Kemper amp is a revolutionary product, it's the same for guitar as invention of sampling for keyboard players. It's reasonably (for what it is) priced, available in music shops and has good support. No brainer for me IMO.