I received the Icarus III on Monday as the USPS tracking indicated. The built quality is pretty solid but will need a little time to get used to the cables. I have only had a couple of hours of listening to the Icarus III today at work. They came with the purple/damper filter already installed. My first impression was that there is too much bass and the bass sounded muddy. I switched to the Vyrus gunmetal/damper filters that I happened to have with me and the bass got cleaned up a little bit. The mids and treble are smoother than the PM4 for sure. Will need more time with the Icarus III to have better idea if I will be selling the PM4.