I participated in a beetroot study a few week ago - waiting for it to be written up and the anlysis of my specific results as each indivdual repsonds different to the juice. In general, more highly trained athletes actually reecive diminshing returns.
I thought they were pretty foul tasting, but then i got ill on the last week of the trial. now my brain has associated the smell and taste with being sick and i simply could not bear to ever have one again. i had a couple of spare bottles and i was gagging whilst throwing them down the drain!