Top critical review
Switch internal gain to low, and it's a fine preamp.
Reviewed in the United States on January 14, 2018
It does what it's supposed to. It is clearly a budget unit, but I don't hear any specific problems. I do think it's funny that they put LEDs inside the mounts for the tubes to make you think they glow. At least it looks cool. Like a lot of tube things, it takes a few minutes to warm up before it performs correctly. If it sounds dark/muddy to you, give it some time. I just turn it on about ten minutes before I want to use it so I don't have to think about it. Remember, at this price point, tubes are almost always a gimmick. You're buying (visual) aesthetics more than anything else.
That being said, there is one big issue. The only gain control is on the circuit baord (see image: https://images-na.ssl-images-amazon.com/images/I/51-LV%2B2lsyL.jpg). Unless you're feeding a very high-headroom analog input, you need to switch this to "low" (mine shipped on high). If you're feeding a digital input (e.g., for digitizing vinyl) it absolutely must be switched to low.
With gain set to high, all modern records will distort badly, even with -20dB of gain applied before the ADC.