The analytic is pretty good if the wind angle does not change too much through a leg. However it does not make it easy to tell what you did right/wrong during a good tack vs a bad tack.
What would be really useful is to be able to chart all the data (BSP, VMG, Heel, SOG etc.) through each tack like you can see here: http://www.cupinfo.com/cupstats/cupstats-americas-cup-2013-tacking-09.php
You could then look at your good tacks and see what you did right/wrong (turning too fast/slow, over steering, etc.)
Alternately, is it possible to download the raw data so I can make such charts myself?
While I’m feature requesting, I have the boat instrument NMEA data on bluetooth, so it would be even better if that could be recorded!