I purchased a unit from Musicteck, and have spent about 10 hours with it so far. I have some... mixed thoughts.
I purchase this unit in an attempt to create a quality transportable setup that mimics my home desktop setup (SMSL D400EX + Cayin IHA-6). I have a Cayin C9 which I /adore/, but I've struggled to find a good portable DAC to pair it with.
Before I dig in too deep, I will say that as an iFi Gryphon fan, this is definitely a fantastic competitor for anything you'd look at the Gryphon for -- it's less warm, more detailed, but also substantially larger. The MicroSD card slot is a really nice feature addition. If you don't need the Gryphon's smaller size, or dislike ifi's signature warmth, the H7 is like a really great option for you.
However, do not use it as a DAC. The amp inside the H7 is /very/ well paired with the DAC circuit, as none of the issues I run into using external amps are noticeable when using the H7 on its own. However as soon as you use those RCA jacks on the back, everything falls apart. Stage is narrow, separation is in the tank, all the tasty native dynamics are gone. I compared directly to the SMSL D400EX, which is my favorite DAC of all time at this point, using SE outputs to both the Cayin IHA-6 and Cayin C9, as well as a few vintage and modern class D speaker amps. I listened with a number of IEMs (Empire Ears Legend Evo, 64audio N8, Noble Audio Kublai Khan) and planar headphones (Hifiman Susvara, Hifiman HE1000v1, Final D8000 Pro Collector's Edition). These issues were easily heard across all amps and transducers. D400EX is exciting, dynamic, detailed. The H7 is a mess.
So I have to give this unit a 3/5. I was really hoping for more, as I am /adoring/ the SMSL implementation of AK4499EX -- but sadly, this just isn't it.