The unit was shipped promptly and arrived in just a short time, despite the fact that I am in the UK. The unit itself is very compact and it would in fact be useful if the suppliers recommended a specific box to suit it. I am using the unit on a Macintosh system where it is used to send signals out to outboard digital signal processing and mixing and then bring them back for internet broadcasting. The unit does this job simply and easily and at high quality. I note that the bit specifications must be the same at input and output (eg 16-bit 44.1kHz: it is simply configured with Audio MIDI Setup on the Mac) - I would have liked to send 24-bit and receive 16 after external dithering - however this is not an audible issue. Overall an excellent product at an affordable price.