Audio is transparent as it should be. Seems to produce only about 40v, but most mics will be happy enough with this. I use it with my Sony PCM D50.
Design and build quality are great. It's compact and feels like it will last. I particularly like the rubber ribs along each side that prevent is from sliding around the table. There are cheaper alternatives but I preferred this one for its size, connection layout and the fact that it runs on a single 9v battery.