I've used them for pressing LPs, but I send in my own metal parts so I can't speak to their in-house mastering. I can tell you that the quality of the vinyl itself, communication, and speed have all been top notch. For what it's worth, they're the cheapest plant I can find for 100 LPs (big caveat here...when using outside lacquers and metal parts to save money), but I've never felt cheated on quality. As far as speed, last order I got test pressings within a week of them receiving my metal parts, then the full run a week after I approved test pressings. Would recommend! Tell 'em that the tall texan sent ya.