The problem with modded units is that it is difficult to have one for an audition or for an comparison with a non modded unit. Modifications could be fantastic on paper, but still it is the ear that is the judge. Even if a unit has all parts inside replaced with the most sophisticated and expensive capacitors, clocks, diodes, resistors, etc., there is no guarantee what so ever that these replacements would "bring the unit up to another level" sonically. There would be audible difference of course, but a difference is not synonimous with improvement.
Chris
Chris