Honestly, I think it would be easier to list Boss pedals with bad buffers. Maybe there are none, for all I know. I've tried a LOT of Boss pedals. The buffers were always fine. No loss of dynamics. Restored high end lost from the 21' cable to and from the board. I prefer getting the high end back through a buffer through trying to EQ it back in by cranking treble (which can raise the noise floor, etc.). Some prefer to lose the high end, of course.