I just recently bought the Focusrite OctoPre MkII 8 channel preamp. I have this connected to my Focusrite Saffire Pro 24 DSP audio interface via ADAT. The purpose of this unit is to expand the number of input channels on my audio interface to 14 providing much more scope for mic/line connections.

It is a really useful addition as it will interface with any device that allows input connection via digital ADAT so will potentially outlast my audio interfaces, certainly in the near future. I have in my sights one of the Universal Audio USB Apollo interfaces which will finally bring my UA plugins over to UAD2. The Octopre MKII will provide an additional 8 channels via ADAT on the Apollo Twin USB.