I am totally sure that with high impedance headphones this amp will sound amazing. However, I’m in with the majority of people here it seems: I’m not fond of the name, badge/logo, and excessive bling, but I think we are a more spartan-minded group in general. I’m betting the jacks and volume pot are very well made and the case looks heavy and solid. That end of things I really appreciate and it’s why I’ve kept my old Beyerdynamic A1 for well over a decade and use it regularly. I was never a huge fan of it sonically until I figured out that it only works well with rather flat and high impedance curves. I had written it off and put it away for years. Barely ever used it and it didn’t come cheap. Under those constraints, it’s great and this amp should be similar but with even more power. I also love having a built in power supply that doesn’t cause problems for my outlets, space, and I don’t like keeping track of wall warts. My JDSLabs Atom is a better headphone amp for a variety of headphones and situations, but the construction makes it more cantankerous to use, I run a small extension cord to the wall wort, and I lost the wall wort for several weeks during a move and nearly ordered a new one. All the while my Beyerdynamic was there for me: sturdy and reliable as ever with a well-damped volume pot that feels satisfying in use.
If the case/logo were more understated but remain heavy/substantial and high quality (no need to get ugly like my old A1), the output impedance reduced to near zero, and the gain levels adjustable, you’d have a knockout in my book. Have a look at the Beyerdynamic A2. It may have been perfect, but I’ve never seen one in the wild let alone used it.