This review is intended primarily for those with hearing disabilities.   I just bought the Classic-ff and have been very pleased with it. I did not do any direct comparisons with other amps; therefore, I won't comment on the audio quality.   I am really enjoying the crossfeed function on this unit as it is helping to negate some of my hearing disability. I have moderate single-sided hearing loss in my left ear and the crossfeed is helping me to hear things that I would otherwise not be able to notice. I can now hear those sounds in my right ear...