I went from cheap trannie amp to valve amp to chip amp to 41hz AMP3. The AMP3 is by far the best one so far - much more detail and clarity, without any harshness. The only minor drawback so far (still experimenting, with no 'special' components and without a proper PSU yet) is a slight lack of bottom-end bass (or maybe it is just accurate, and not 'overblown' ?).
Just my tuppence-worth!