The maintainer of
Knowzy (a commission-based website with detailed guides on selected topics) recently posted a guide to USB turntables based on a lot of input from the HydrogenAudio community, including myself. It is very accurate and free of audiophile hyperbole. I'd recommend it to people who are considering purchasing a USB turntable and would like to know all the technical reasons to (not) purchase one. (FWIW, I have absolutely no ties to Knowzy besides my contributions to the guide.)