If you believe that all amps sound the same, you either have poor hearing or haven't demoed on a decently resolving system. I don't disagree with your second point though, but everyone knows my opinion of the Personas in any event.
Anecdotally, my local dealer who runs a pair of Persona 3Fs in his second system at home says that he is done after a couple hours of listening.
Anecdotally, my local dealer who runs a pair of Persona 3Fs in his second system at home says that he is done after a couple hours of listening.