-Poor outside noise insolation, not ideal if you are planning to record drums to a click/stem.
-Phone cord is heavy and relatively short; perfect for listening while walking around, but again, not ideal for drumming.
-The sound has a cardboard quality to it, very weak in the 80/100Hz region, quite strong around the 4kHz mark.
On the plus side, they are reasonably comfortable, which is a bit light for its purported use.
Will stick to the Superlux HD-665 (heavier and breaks after six months, but works great during that timespan).