I for one love DSP.. I started out using EMU/Ensoniqs Paris system, which I still use to this day as wellas PT HD-3(expanded)and Nuendo..
Working in naitive land is cool, especialy on our custome built Dual Opterons systems, BUT.. Even with all that power, the 2 DSP based systems (Paris & Pro Tools HD 3) are smooth and robust. You are mixing in total confidence. Not to say that mixing Neundo is bad, it's not, but one feels like a nice well engineered 4 cylinder(multi-valved)Honda Accord and the other feels like an 8 cylinder (multi-valved ) Lexus..
Having said all of that, I welcome this new product fron Focusrite. It's about time somebody came up with solid solutions for the Native based studio.
But, i do agree with Mr Lakis, adding firewire to a system is "Risky Business". IRQ sharing comes into play and one can really screw things up..