I LOVE LOVE this bitperfect filter. The iFi BL was my gateway to more expensive R2R/NOS products. It sounds so good! My only complaint here is that this natural sound has a small 'haze' to it. That DSD1793 chip can only go so far I suppose. If @iFi audio ever revamps their iDSD portable with balanced 2.5/4.4mm, usb-c etc, while keeping the BitPerfect filter I'd buy it instantly again. I really do kinda miss it.