A 50w Headphone amplifier means I will merely marvel at the concept, but never incorporate/own in my own headphones system(s)... but very cool, in concept.
Somewhat OT, but I'm pretty certain that my one big "planned audio purchase" for 2019 is in fact some RAAL ribbon speakers (likely/hopefully Ascend Sierra Towers and matching Middle).
Living Room: Sony x940E; Denon x4400h; Ascend Sierra RAAL Tower L/R's and 2EX center, Ascend HTM-200SE Rears, Rythmik F25 sub. NVidia Shield, ATV4k, OPPO UDP-203, CCA.
Basement: Samsung PN58B650 LN-T4065F (x2); Onkyo TX-NR809; Polk Monitor 70 Series II L/R's, SVS PB-1000 sub. NVidia Shield (x2), Windows Desktop, CCA.