Strange enough the "fizz issue" for me is a thing of the past when I used exclusivly my beloved tube rigs (or the ones of my clients) for recordings..
Once I have the "right profile" and removed all remaining fizz the problem is solved forever.I never had this with tube rigs where fizz appears whenever "it wants" even when there was no fizz issue at the very beginning of the recording session (hours or even a day ago) or becomes a problem because of whatever changes (temperature etc) while nothing was changed in the recording chain(tube rig,micing,pre-EQ etc)..
Another big advantage is that now I dont need to ask myself anymore if I have "now fizz" because of any of these unforeseeable factors like temperature,"psychology" or whatever..I can be 100% sure that with the kemper the profile is still the same me and the client have raved about a day ago and still did two hours ago while we were eating at the indian fast food shop..the crucial "taking the guitar and playing the first chord" after a few hours (after lunch,drinking,laughing,argueing about song parts,hearing asian muzak,getting your @@ squeezed over your phone by the beloved voice of your angy girlfriend which "did not see you for two days" etc,etc..you name it)-moment does not play this big role anymore.
This is maybe the biggest plus for the kemper when it comes to the fizz-issue:Once you have "killed the fizz" with a certain profile it stays dead and does not become a fu@@ing zombie.
Something even the hardest tube-rig deciple must admit(though he will never mention it)..