I have only heard the W5000 in less than ideal conditions. I think I will eventually be in the camp that will own both. I have been a long time owner of the AD2000 and love it. The sound is balanced and coherent coming out of the yammy, making small scale music just plain musical. The bass is one of the hardest aspects of this phone to discribe. It has bass quality in gobs, but it might be considered lean on some types of music. Classical I never wish for more, but for techno I would certainly agree its lean, and yet others think this is one of the best techno phones out there, because its so fast. I take the view that if the big bass is in the recording, it will come through on the phone. Unlike the post below, I don't see the AD2000's performance as below the W5000. They both offer different sonic packages. Fit issues, as mentioned above, are notorious with both phones.