Not a scientific experiment Tonka!! Just the fact that I much prefer the layout and versatility of the RB over the SBS, that's all :)
My SBS-1 is the first version and I have it hooked up to an old XP desktop that does nothing else but run the SBS without an internet connection to the computer. Also it has an outside antenna on the roof and a pre-amp, with a 23" LCD screen. It has served me well with no complaints, hooked up to my AvDb Global database with a snoopy programme.
That is the one drawback for me with the Airnav, that I am unable to hook it up to my own Db rather than the central Airnav one, unless anybody knows otherwise?
regards clive.