I realise this is a SJY forum and I'm only here because I will end up getting a pair of Moonlights and love the discussion. Digressing a tiny bit (we all seem to have done), I have all low z planars at the moment. I have recently tested Auteur, Atrium O and Caldera in a shop in QLD Australia using a ferum stack amongst other things. Just quickly, Auteur sounded laid back very similar to my (wonderful) Sendy Peacocks , AO were a huge technical step up and lovely HPs, but just like the Peacocks, they couldn't handle technical, superfast speed metal (it all muddied a tad). The Caldera's...........now they were AWESOME imo!!!!!!!!! ANd as high-end planars, they handled speed metal with ease. I will definitely get a pair of them at some stage in my HP journey. But my Hifiman HE1000 Stealths to me are sublime, as are my new JM Audio xtc 2.5 closeds. My next purchase will definitely be a pair of Moonlights - keep sending thoughts/reviews please, both good and constructive. Thanks!!!