Can't comment directly on the fireface 800 but have the newer UFX and drivers solid, pres clean and good quality,convertors same.
Also the "Totalmix" control/monitoring software that comes with all RME is good.
RME is a very good choice and they ONLY make convertors and interfaces so they concentrate on them and support them well.
Unlike TC who have their fingers in so many pies its not true
I would go RME
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