i guess its great to have the option so every one can choose what suits them best...the function of seeing a 10sec ave after a run doesn't interest me as much as a peak speed does...at the end of the day you get the 10 sec average from the software anyway.
if you are a keen follower of the gpsss site then i can see some real advantages to knowing how you are fairing in the 10sec categories while you are sailing.
i must admit i found the genie a little confusing as it wasn't telling me how fast i had gone on a particular run just the 10sec ave (maybe i didn't have it configured properly?)
anyway as nebs mentioned i too, find it hard to concentrate on the screen while sailing,its got me stuffed how some guys can watch the speedo while sailing i would crash every time

so how many people have crashed while looking at their gps's?