While physically speaking the quality of this unit is great, the software implementation leaves a lot to be desired. Many configuration options, such as extending the number of inputs through the ADAT connection, require using the Focusrite Control proprietary software suite, which is only available for Windows and Mac. Why not make all options configurable without a PC, and especially without a proprietary piece of software?
This device desperately needs hardware controls for user settings. With that, all Focusrite would really need to do to provide Linux support is to make the device USB class compliant. Unfortunately, since the driver is proprietary, the Linux driver is a reverse-engineered one that works but still has some issues, the device being as new as it is. The free/open source community will fix the driver issues in time, and the device is already quite usable, but all the troulbe make one beg the question: why make things so difficult, Focusrite?
Otherwise, the device is fine. Lots of inputs right into your PC - what more can you ask for.