Pros: Smooth and balanced. Like the HD600, but with more precise timbre
Cons: Non-removable cord
I have the 600 Ohm version of these, so other impedance models will probably vary in sound. This said, I find this to be a wonderfully balanced set. They exhibit no harshness to my ears across several genres such as Rock, Metal, Pop, Jazz Fusion, and classical. I believe the timbre of the instruments is what sets this one apart from other easy listening phones like the HD600 and 650s. You can hear the resonance of wood on strings in classical arrangements, especially quartets and such arrangements. The upright bass in several of Holly Cole's releases is clear and clean. Meanwhile, that timbre is what carries the signature of the impact from bass drums and the upright bass alike. For Rock and Metal, it conveys the dynamics and power without irritation.
The natural sound that these produce is preserved without the phones sounding harsh or sibilant, as many of the detail champs exhibit. To me, these are easy listening cans, which don't lose the instrumental details. Unfortunately, my only two other references are a pair of HD600s and HD650s. Those are also very easy listening, but fail to convey the timbre of instruments as well as the 880 Premiums, which is what really sets them apart. Great cans for the price.