Works very well. The only thing I hope it had is a longer cable. Seriously, not everyone has it plugged to their Power Mac. Not everyone can afford a Power Mac :-). Also a problem is the fact that even if you have a longer cable to replace the one they give you, you cannot use it. The cable that comes with it is permanently connected to the device and cannot be removed. Bad engineering.
I got a pair for my wife also and we both love it. Quality of sound is not great but my integrated sound card is not great either :-). For me it's the ability to run tutorials and listen to things quietly without bothering anyone else at home.
Battery life is excellent. We received it over three week ago and so far each set got ONE (!!) charge only. We use it for about 2 hours daily. Comfort is average, it should have had the ability to extend the arms and give more comfort for different head sizes. However, it's not bad at all.