I bought the HD25 Aluminium 3 months ago and so far this headphone has done nothing but impress me. For the qualities it delivers I find it's still a highly overlooked headphone due to the predecessor still being sold.
Excellent sound: Rich and slightly warm non-fatiguing sound, punchy bass, excellent extension & detail, speed, seperation and musical; ALUMINIUM
Lower treble not as upfront; Dominant 100-300hz bass region not for all genres; not as spacious or airy as over-ear