money4me247, did you read the vast number of head-fi threads, the amazon reviews and other reviews about the Yamaha pro 400? They say that the pro 500 best the pro 400 because pro 400 lacks the power, spatial depth, and overall clarity of its pricier sibling, the Yamaha PRO 500. is this true!? I mean not all the people who wrote reviews are flat out wrong right? I know pricewise i avoided a disaster but do you think the 500's are better than the 400's . The aluminium alloy earcup somehow better enhance the sound as said by the reviews? Also if you check camelcamelcamel my 400's came new at $126 at one point in time as in March 2014. Damn wish i bought them then!