Thank you, @rivinyl, for your brief review. The other review I came across over Amerzon is as follows:
I've tried numerous tube preamps and buffers in search of that tube warmth or bloom. If you're trying to do this cheap as I am you may have already tried products from Aiyima, Douk, Xduoo, Yaquin, Bellari and on and on. None of these added "warmth" or if they did they lacked in another areas and I would not recommend any of them. The Schiit Buf Coherence seems engineered specifically to address this shortfall. Most importantly there is a difference in the audio that exits this device compared to the input and for some material I would describe it as pleasant. To my ears the midrange sort of opens a bit and widens the sound stage. It's not dramatic, but subtle. There is no low end roll of to my ears compared to other products like this. The gain switch works well and may add to the subtle effect. It's solidly built for a small inexpensive device, and comes with a beefy linear power supply. ... I do recommend folks try this device as it does what it says unlike every other device I've tried.
