My Z5 arrived yesterday. I purchased from a highly-rated eBay Japanese seller who provided free express shipping via DHL, including a hand written letter and an origami crane - nice touch. Until my Willow Audio adapters arrive I am using the 'unused' 3.5mm cable that came with my Z1R, which fits like a glove. Maybe it's to do with them having a 16mm driver, but having owned these before, they were always a great example of what a higher-powered output could achieve, even for iems. Like my first experience demoing at e earphone, I tried with my phone and they sounded mid-bassy and muddy, even my WM1Z's 3.5mm doesn't cut it, I can't wait to go balanced.