I have been using FR from the beginning...not because I wanted to. I don't like tweeters with a guitar signal. I tried using a cabinet, but the speaker is 1/2 your tone. When studio profiles were created using different speakers, I had to tweak every one to match the speaker I was using.
I gave up as it was more authentic using the FR cab in spite of the tweeter.
I'm patiently waiting for the Kone to be released so I can hear how it's supposed to be and retire my K10.