Pros: Extremely tight bass response, clear, sturdy, good seperation, excellent isolation
Cons: too long cable for portable use, staging somewhat limited due to the size
The HD25 series need no introduction, I think the Aluminiums are the best in the lineup, they sound very balanced with tight punchy bass that extends lower than the original HD25, it is a warm, clean sounding headphone. The Amperior in comparison packs even more punch, but always sounded a little hard to my ears when it comes to bright female vocals, this is much improved on the Alus while still retaining its sparkle. These are a real winner :)
Compared to some closed over-ear rivals they lack some soundstage height, width is decent though, it will still sound expansive on binaural recordings but it is not an over ear or open headphone obviously. Just something to keep in mind.