One of the most reliable and cleaning sounding audio recording interface in my opinion and many others. I have had it for many years and it's only been used at home on a rack. I am downgrading to 2 channels to save space (as I rarely record more than 2 channels at a time). Works with Firewire 400 and 800, as well as on Mac via Thunderbolt adapters. Everything functions as it should. In excellent condition! Asking $650USD shipped lower 48 USA & Canada. Payment with either Cash, Postal MO or PayPal or Interac e-Transfer payment.